diff --git a/sidepanel/sidepanel.js b/sidepanel/sidepanel.js
index 2760ce9..2bbb36d 100644
--- a/sidepanel/sidepanel.js
+++ b/sidepanel/sidepanel.js
@@ -2167,22 +2167,55 @@ function getGpcHelperAutoModeEnabled(state = latestState) {
   return Boolean(state?.gopayHelperAutoModeEnabled);
 }
 
-function hasGpcAutoModePermissionField(payload = {}) {
-  if (!payload || typeof payload !== 'object' || Array.isArray(payload)) {
+function normalizeGpcAutoModePermissionValue(value) {
+  if (typeof value === 'boolean') {
+    return value;
+  }
+  if (typeof value === 'number') {
+    if (value === 1) return true;
+    if (value === 0) return false;
+  }
+  const normalized = String(value ?? '').trim().toLowerCase();
+  if (!normalized) {
+    return null;
+  }
+  if (['true', '1', 'yes', 'y', 'on', 'enabled', 'enable'].includes(normalized)) {
+    return true;
+  }
+  if (['false', '0', 'no', 'n', 'off', 'disabled', 'disable'].includes(normalized)) {
     return false;
   }
-  return payload.auto_mode_enabled !== undefined
-    || payload.autoModeEnabled !== undefined
-    || payload.auto_enabled !== undefined
-    || payload.autoEnabled !== undefined
-    || (payload.data && typeof payload.data === 'object' && !Array.isArray(payload.data) && hasGpcAutoModePermissionField(payload.data));
+  return null;
+}
+
+function getGpcAutoModePermissionFromPayload(payload = {}) {
+  if (!payload || typeof payload !== 'object' || Array.isArray(payload)) {
+    return null;
+  }
+  for (const key of ['auto_mode_enabled', 'autoModeEnabled', 'auto_enabled', 'autoEnabled']) {
+    if (payload[key] !== undefined) {
+      return normalizeGpcAutoModePermissionValue(payload[key]);
+    }
+  }
+  if (payload.data && typeof payload.data === 'object' && !Array.isArray(payload.data)) {
+    return getGpcAutoModePermissionFromPayload(payload.data);
+  }
+  return null;
+}
+
+function shouldPreserveSelectedGpcAutoMode(state = latestState) {
+  const payloadPermission = getGpcAutoModePermissionFromPayload(state?.gopayHelperBalancePayload);
+  return normalizeGpcHelperPhoneModeValue(state?.gopayHelperPhoneMode) === GPC_HELPER_PHONE_MODE_AUTO
+    && (Boolean(state?.gopayHelperAutoModeEnabled) || payloadPermission === true);
+}
+
+function hasGpcAutoModePermissionField(payload = {}) {
+  return getGpcAutoModePermissionFromPayload(payload) !== null;
 }
 
 function isGpcAutoModePermissionDenied(state = latestState) {
-  if (getGpcHelperAutoModeEnabled(state)) {
-    return false;
-  }
-  return hasGpcAutoModePermissionField(state?.gopayHelperBalancePayload);
+  const payloadPermission = getGpcAutoModePermissionFromPayload(state?.gopayHelperBalancePayload);
+  return payloadPermission === false;
 }
 
 function normalizeGpcRemainingUsesValue(value) {
@@ -3389,7 +3422,10 @@ function collectSettingsPayload() {
       ? selectGpcHelperPhoneMode.value
       : (latestState?.gopayHelperPhoneMode || 'manual')
   );
-  const effectiveGpcPhoneMode = (typeof isGpcAutoModePermissionDenied === 'function' && isGpcAutoModePermissionDenied(latestState))
+  const preserveSelectedGpcAutoMode = typeof shouldPreserveSelectedGpcAutoMode === 'function'
+    ? shouldPreserveSelectedGpcAutoMode(latestState)
+    : false;
+  const effectiveGpcPhoneMode = (!preserveSelectedGpcAutoMode && typeof isGpcAutoModePermissionDenied === 'function' && isGpcAutoModePermissionDenied(latestState))
     ? 'manual'
     : selectedGpcPhoneMode;
   const selectedGpcOtpChannel = normalizeGpcOtpChannelSafe(
@@ -7370,7 +7406,11 @@ function updatePlusModeUI() {
   );
   const gpcAutoModeDenied = isGpcAutoModePermissionDenied(latestState);
   const gpcAutoModeEnabled = getGpcHelperAutoModeEnabled(latestState);
-  const isGpcAutoMode = !gpcAutoModeDenied && gpcPhoneMode === GPC_HELPER_PHONE_MODE_AUTO;
+  const preserveSelectedGpcAutoMode = typeof shouldPreserveSelectedGpcAutoMode === 'function'
+    ? shouldPreserveSelectedGpcAutoMode(latestState)
+    : false;
+  const effectiveGpcAutoModeDenied = gpcAutoModeDenied && !preserveSelectedGpcAutoMode;
+  const isGpcAutoMode = !effectiveGpcAutoModeDenied && gpcPhoneMode === GPC_HELPER_PHONE_MODE_AUTO;
   const gpcOtpChannel = normalizeGpcOtpChannelValue(
     typeof selectGpcHelperOtpChannel !== 'undefined' && selectGpcHelperOtpChannel
       ? selectGpcHelperOtpChannel.value
@@ -7385,7 +7425,7 @@ function updatePlusModeUI() {
     ? normalizePlusPaymentMethod(selectPlusPaymentMethod.value)
     : method;
   const gpcRowsVisible = enabled && selectedMethod === gpcValue;
-  const canShowGpcModeSelector = gpcRowsVisible && (gpcAutoModeEnabled || !gpcAutoModeDenied);
+  const canShowGpcModeSelector = gpcRowsVisible && (gpcAutoModeEnabled || !effectiveGpcAutoModeDenied);
   const localSmsControlsVisible = gpcRowsVisible && !isGpcAutoMode;
   const effectiveLocalSmsEnabled = !isGpcAutoMode && localSmsEnabled;
   if (typeof selectPlusPaymentMethod !== 'undefined' && selectPlusPaymentMethod) {
@@ -7430,7 +7470,7 @@ function updatePlusModeUI() {
     rowGpcHelperPhoneMode.style.display = canShowGpcModeSelector ? '' : 'none';
   }
   if (typeof selectGpcHelperPhoneMode !== 'undefined' && selectGpcHelperPhoneMode) {
-    selectGpcHelperPhoneMode.value = gpcAutoModeDenied ? GPC_HELPER_PHONE_MODE_MANUAL : gpcPhoneMode;
+    selectGpcHelperPhoneMode.value = effectiveGpcAutoModeDenied ? GPC_HELPER_PHONE_MODE_MANUAL : gpcPhoneMode;
   }
   [
     typeof rowGpcHelperCountryCode !== 'undefined' ? rowGpcHelperCountryCode : null,
@@ -11765,8 +11805,9 @@ btnGpcHelperBalance?.addEventListener('click', async () => {
       gopayHelperAutoModeEnabled: getGpcAutoModeEnabledFromResponse(response),
       gopayHelperApiKeyStatus: response?.apiKeyStatus || response?.data?.status || response?.payload?.data?.status || response?.payload?.status || '',
     };
+    const selectedModeBeforeBalanceState = getSelectedGpcHelperPhoneMode();
     syncLatestState(nextState);
-    if (!nextState.gopayHelperAutoModeEnabled && getSelectedGpcHelperPhoneMode() === GPC_HELPER_PHONE_MODE_AUTO) {
+    if (!nextState.gopayHelperAutoModeEnabled && selectedModeBeforeBalanceState === GPC_HELPER_PHONE_MODE_AUTO) {
       selectGpcHelperPhoneMode.value = GPC_HELPER_PHONE_MODE_MANUAL;
       syncLatestState({ gopayHelperPhoneMode: GPC_HELPER_PHONE_MODE_MANUAL });
       await saveSettings({ silent: true, force: true }).catch(() => {});
@@ -13728,7 +13769,9 @@ chrome.runtime.onMessage.addListener((message, _sender, sendResponse) => {
       if (message.payload.gopayHelperPhoneMode !== undefined && selectGpcHelperPhoneMode) {
         selectGpcHelperPhoneMode.value = normalizeGpcHelperPhoneModeValue(message.payload.gopayHelperPhoneMode);
       }
-      if (message.payload.gopayHelperAutoModeEnabled === false && selectGpcHelperPhoneMode?.value === GPC_HELPER_PHONE_MODE_AUTO) {
+      if (message.payload.gopayHelperAutoModeEnabled === false
+        && selectGpcHelperPhoneMode?.value === GPC_HELPER_PHONE_MODE_AUTO
+        && isGpcAutoModePermissionDenied(latestState)) {
         selectGpcHelperPhoneMode.value = GPC_HELPER_PHONE_MODE_MANUAL;
         syncLatestState({ gopayHelperPhoneMode: GPC_HELPER_PHONE_MODE_MANUAL });
         showToast('当前 API Key 未开通自动模式，已切回手动模式。', 'warn', 2200);
diff --git a/tests/sidepanel-plus-payment-method.test.js b/tests/sidepanel-plus-payment-method.test.js
index ecf00ef..92c0e6b 100644
--- a/tests/sidepanel-plus-payment-method.test.js
+++ b/tests/sidepanel-plus-payment-method.test.js
@@ -134,6 +134,9 @@ test('sidepanel Plus UI hides PayPal account selector while GoPay is selected',
     extractFunction('getSelectedPlusPaymentMethod'),
     extractFunction('normalizeGpcHelperPhoneModeValue'),
     extractFunction('getGpcHelperAutoModeEnabled'),
+    extractFunction('normalizeGpcAutoModePermissionValue'),
+    extractFunction('getGpcAutoModePermissionFromPayload'),
+    extractFunction('shouldPreserveSelectedGpcAutoMode'),
     extractFunction('hasGpcAutoModePermissionField'),
     extractFunction('isGpcAutoModePermissionDenied'),
     extractFunction('normalizeGpcOtpChannelValue'),
@@ -217,6 +220,9 @@ test('sidepanel Plus UI shows GPC fields and purchase button only for GPC', () =
     extractFunction('getSelectedPlusPaymentMethod'),
     extractFunction('normalizeGpcHelperPhoneModeValue'),
     extractFunction('getGpcHelperAutoModeEnabled'),
+    extractFunction('normalizeGpcAutoModePermissionValue'),
+    extractFunction('getGpcAutoModePermissionFromPayload'),
+    extractFunction('shouldPreserveSelectedGpcAutoMode'),
     extractFunction('hasGpcAutoModePermissionField'),
     extractFunction('isGpcAutoModePermissionDenied'),
     extractFunction('normalizeGpcOtpChannelValue'),
@@ -310,6 +316,9 @@ test('sidepanel hides GPC auto mode selector when API Key has no auto permission
     extractFunction('getSelectedPlusPaymentMethod'),
     extractFunction('normalizeGpcHelperPhoneModeValue'),
     extractFunction('getGpcHelperAutoModeEnabled'),
+    extractFunction('normalizeGpcAutoModePermissionValue'),
+    extractFunction('getGpcAutoModePermissionFromPayload'),
+    extractFunction('shouldPreserveSelectedGpcAutoMode'),
     extractFunction('hasGpcAutoModePermissionField'),
     extractFunction('isGpcAutoModePermissionDenied'),
     extractFunction('normalizeGpcOtpChannelValue'),
@@ -353,12 +362,104 @@ return { updatePlusModeUI, selectGpcHelperPhoneMode, plusPaymentMethodCaption, r
   assert.match(api.plusPaymentMethodCaption.textContent, /手动/);
 });
 
+test('sidepanel keeps selected GPC auto mode when persisted permission survives stop refresh', () => {
+  const bundle = [
+    extractFunction('normalizePlusPaymentMethod'),
+    extractFunction('getSelectedPlusPaymentMethod'),
+    extractFunction('normalizeGpcHelperPhoneModeValue'),
+    extractFunction('getGpcHelperAutoModeEnabled'),
+    extractFunction('normalizeGpcAutoModePermissionValue'),
+    extractFunction('getGpcAutoModePermissionFromPayload'),
+    extractFunction('shouldPreserveSelectedGpcAutoMode'),
+    extractFunction('hasGpcAutoModePermissionField'),
+    extractFunction('isGpcAutoModePermissionDenied'),
+    extractFunction('normalizeGpcOtpChannelValue'),
+    extractFunction('updatePlusModeUI'),
+  ].join('\n');
+
+  const api = new Function(`
+let latestState = {
+  plusPaymentMethod: 'gpc-helper',
+  gopayHelperPhoneMode: 'auto',
+  gopayHelperAutoModeEnabled: true,
+  gopayHelperBalancePayload: { auto_mode_enabled: true },
+};
+let currentPlusPaymentMethod = 'gpc-helper';
+const inputPlusModeEnabled = { checked: true };
+const selectPlusPaymentMethod = { value: 'gpc-helper', style: { display: 'none' } };
+const GPC_HELPER_PHONE_MODE_AUTO = 'auto';
+const GPC_HELPER_PHONE_MODE_MANUAL = 'manual';
+const plusPaymentMethodCaption = { textContent: '' };
+const rowPayPalAccount = { style: { display: '' } };
+const rowPlusPaymentMethod = { style: { display: 'none' } };
+const rowGpcHelperApi = { style: { display: 'none' } };
+const rowGpcHelperCardKey = { style: { display: 'none' } };
+const rowGpcHelperPhoneMode = { style: { display: 'none' } };
+const selectGpcHelperPhoneMode = { value: 'auto' };
+const rowGpcHelperCountryCode = { style: { display: 'none' } };
+const rowGpcHelperPhone = { style: { display: 'none' } };
+const rowGpcHelperOtpChannel = { style: { display: 'none' } };
+const selectGpcHelperOtpChannel = { value: 'whatsapp' };
+const rowGpcHelperLocalSmsEnabled = { style: { display: 'none' } };
+const inputGpcHelperLocalSmsEnabled = { checked: false };
+const rowGpcHelperLocalSmsUrl = { style: { display: 'none' } };
+const rowGpcHelperPin = { style: { display: 'none' } };
+${bundle}
+function syncLatestState(nextState) { latestState = { ...latestState, ...nextState }; }
+return {
+  updatePlusModeUI,
+  selectGpcHelperPhoneMode,
+  getSelectedPhoneMode() { return selectGpcHelperPhoneMode.value; },
+  getPayloadPhoneMode() {
+    return (() => {
+      const selectedGpcPhoneMode = normalizeGpcHelperPhoneModeValue(selectGpcHelperPhoneMode.value);
+      const preserveSelectedGpcAutoMode = shouldPreserveSelectedGpcAutoMode(latestState);
+      return (!preserveSelectedGpcAutoMode && isGpcAutoModePermissionDenied(latestState)) ? 'manual' : selectedGpcPhoneMode;
+    })();
+  },
+  applyDataUpdated(payload) {
+    syncLatestState(payload);
+    if (payload.gopayHelperPhoneMode !== undefined) {
+      selectGpcHelperPhoneMode.value = normalizeGpcHelperPhoneModeValue(payload.gopayHelperPhoneMode);
+    }
+    if (payload.gopayHelperAutoModeEnabled === false
+      && selectGpcHelperPhoneMode?.value === GPC_HELPER_PHONE_MODE_AUTO
+      && isGpcAutoModePermissionDenied(latestState)) {
+      selectGpcHelperPhoneMode.value = GPC_HELPER_PHONE_MODE_MANUAL;
+      syncLatestState({ gopayHelperPhoneMode: GPC_HELPER_PHONE_MODE_MANUAL });
+    }
+    updatePlusModeUI();
+  },
+  rows: { rowGpcHelperPhoneMode, rowGpcHelperPhone, rowGpcHelperOtpChannel, rowGpcHelperPin },
+};
+`)();
+
+  api.updatePlusModeUI();
+  assert.equal(api.getSelectedPhoneMode(), 'auto');
+  assert.equal(api.getPayloadPhoneMode(), 'auto');
+  assert.equal(api.rows.rowGpcHelperPhoneMode.style.display, '');
+  assert.equal(api.rows.rowGpcHelperPhone.style.display, 'none');
+
+  api.applyDataUpdated({
+    autoRunning: false,
+    autoRunPhase: 'stopped',
+    gopayHelperAutoModeEnabled: false,
+  });
+
+  assert.equal(api.getSelectedPhoneMode(), 'auto');
+  assert.equal(api.getPayloadPhoneMode(), 'auto');
+  assert.equal(api.rows.rowGpcHelperPhone.style.display, 'none');
+});
+
 test('sidepanel keeps selected GPC auto mode before permission has been queried', () => {
   const bundle = [
     extractFunction('normalizePlusPaymentMethod'),
     extractFunction('getSelectedPlusPaymentMethod'),
     extractFunction('normalizeGpcHelperPhoneModeValue'),
     extractFunction('getGpcHelperAutoModeEnabled'),
+    extractFunction('normalizeGpcAutoModePermissionValue'),
+    extractFunction('getGpcAutoModePermissionFromPayload'),
+    extractFunction('shouldPreserveSelectedGpcAutoMode'),
     extractFunction('hasGpcAutoModePermissionField'),
     extractFunction('isGpcAutoModePermissionDenied'),
     extractFunction('normalizeGpcOtpChannelValue'),