Gmail suddenly stopped syncing on my Android, how can I fix this issue permanently?

When Gmail stops syncing on Android, start by checking if sync is enabled: open Gmail, go to Settings > your account > Sync Gmail, and make sure it’s toggled on.

Also confirm that Settings > Accounts > Google > Account sync has Gmail enabled, then clear the Gmail app cache and restart the phone.

If the issue persists, update both the Gmail app and Android System WebView in the Play Store, since outdated components can block sync.

Disabling battery optimization for Gmail under Settings > Apps > Gmail > Battery ensures the app keeps syncing in the background. These steps usually resolve the problem long term without needing to reinstall.