App Crashes and Force Stops
App crashes: application unexpectedly closes. First steps: restart the app. If persistent: force stop then reopen. Android: Settings → Apps → [App Name] → Force Stop. iOS: swipe up from bottom (iPhone X+) or double-press Home (older) → swipe up on the app card to close. Clear app cache (Android): Settings → Apps → [App Name] → Storage → Clear Cache. Does not delete user data — safe first step. Clear app data (Android): Settings → Apps → [App Name] → Storage → Clear Data. Removes all app data including login credentials, local content — last resort before reinstall. iOS cache clearing: no direct cache clear option — sign out and sign in, or reinstall app. Update the app: outdated apps crash due to API changes. Check App Store / Play Store for updates. Reinstall the app: uninstall completely, reinstall from official store — resolves corrupted app installation. Check device storage: apps crash when device storage is critically low (<500 MB free). Free up space.
App Performance Issues
Slow app performance: check for multiple apps running in background consuming RAM. Close background apps: Android: recent apps button → swipe to close. iOS: App Switcher → swipe to close. Storage full: Android and iOS performance degrades significantly when storage is near capacity (typically below 10-15% free). Identify storage-hungry apps: iOS: Settings → General → iPhone Storage. Android: Settings → Storage → Apps. Offload/delete apps not used, move photos to cloud. Background app refresh (iOS): Settings → General → Background App Refresh — limit which apps can refresh in background (saves battery and RAM). Animated or widget-heavy home screens consume more RAM. Restart the device: clears RAM and resolves transient slowdowns. Factory reset: last resort for severe performance degradation that doesn't respond to other fixes — backup first.
Account Sync Issues
Sync failures prevent contacts, calendar, email, or photos from updating. Check network connectivity: sync requires internet access. Toggle airplane mode off and on — forces reconnection. Check account credentials: Settings → Accounts (Android) or Settings → [Account Name] (iOS). Re-enter credentials if expired or changed. Manually trigger sync: Android: Settings → Accounts → [Account] → Account sync → Sync Now. iOS: pull down to refresh in specific apps. Check account storage: if Google Drive, iCloud, or Outlook storage is full, sync stops. Purchase more storage or delete old files. Date and time: incorrect device date/time causes certificate errors that block sync. Enable automatic date/time. App permissions: sync may require background data access. Android: Settings → Apps → [App] → Background data → Allow. Battery optimization: some Android manufacturers aggressively kill background processes — exclude sync apps from battery optimization.
Battery Drain from Apps
Apps consuming excessive battery drain the device quickly. Identify battery-draining apps: iOS: Settings → Battery → Battery Usage by App (last 24 hours / 10 days). Android: Settings → Battery → Battery Usage. Common culprits: streaming apps (video, music), mapping apps with GPS, social media with constant refresh, email with frequent polling. Solutions: close background apps. Reduce location permissions to 'While using the app' instead of 'Always' (or deny entirely if GPS isn't needed). Reduce app refresh frequency: iOS: Background App Refresh (off for specific apps). Android: sync intervals in app settings. Enable Low Power Mode (iOS) or Battery Saver (Android) to automatically reduce background activity. Screen-on time is the biggest battery consumer — reduce screen brightness, enable adaptive brightness, reduce screen timeout. Notifications: frequent notification-heavy apps (social media) keep the radio awake. Reduce notification frequency or disable.
App Update and Compatibility Issues
App updates: keep apps updated — bug fixes, security patches, performance improvements. Enable auto-updates: iOS: Settings → App Store → App Updates (on). Android: Play Store → Profile → Settings → Network preferences → Auto-update apps. App not available in your region: some apps are geographically restricted. Country/region mismatch on Apple ID or Google account. Incompatible iOS/Android version: old devices running old OS cannot install apps that require newer OS versions. Check minimum OS requirements in the app store listing. App greyed out (iOS): app is not compatible with your iOS version or device. Some older apps may not have been updated to support 64-bit (iOS 11+ requirement). Purchased app not appearing: sign in to the same Apple ID / Google account used for the purchase. Re-download from purchase history. iOS: App Store → Account → Purchased. Android: Play Store → Library.