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Mobile App Troubleshooting

Common mobile app issues and solutions for iOS and Android.

Overview​

This guide helps diagnose and resolve common mobile app problems across development, deployment, and production.

App Crashes​

Symptoms​

  • App closes unexpectedly
  • Frequent crashes
  • Crash on specific actions
  • Crash on launch

Common Causes​

1. Memory Issues:

  • Memory leaks
  • Out of memory
  • Large image loading
  • Background processes

2. Code Errors:

  • Null pointer exceptions
  • Array index out of bounds
  • Unhandled exceptions
  • Threading issues

3. Device Compatibility:

  • OS version issues
  • Device-specific bugs
  • Screen size problems

Solutions​

Debug Crashes:

iOS:
- Check Xcode console
- Review crash logs
- Use Instruments
- Enable crash reporting

Android:
- Check Logcat
- Review stack traces
- Use Android Profiler
- Enable crash reporting

Fix Memory Issues:

  • Implement proper memory management
  • Optimize image loading
  • Release unused resources
  • Use lazy loading
  • Profile memory usage

Handle Errors:

  • Try-catch blocks
  • Null checks
  • Proper error handling
  • Graceful degradation

Performance Issues​

Symptoms​

  • Slow app performance
  • Laggy UI
  • Slow loading
  • Battery drain

Common Causes​

1. Inefficient Code:

  • Heavy operations on main thread
  • Inefficient algorithms
  • Too many network calls

2. Poor Resource Management:

  • Large images
  • Unoptimized assets
  • Memory leaks

3. Network Issues:

  • Too many API calls
  • Large payloads
  • No caching

Solutions​

Optimize Performance:

  • Move heavy operations to background
  • Optimize algorithms
  • Reduce network calls
  • Implement caching
  • Lazy load content

Optimize Resources:

  • Compress images
  • Use appropriate formats
  • Implement image caching
  • Remove unused assets

Network Optimization:

  • Batch API calls
  • Implement caching
  • Compress payloads
  • Use CDN

App Store Rejection​

Symptoms​

  • App rejected by Apple/Google
  • Compliance issues
  • Policy violations

Common Causes​

1. Guideline Violations:

  • Missing privacy policy
  • Inappropriate content
  • Misleading metadata
  • Broken functionality

2. Technical Issues:

  • Crashes on review
  • Missing features
  • Poor performance
  • Incomplete implementation

3. Metadata Issues:

  • Misleading screenshots
  • Incorrect descriptions
  • Missing information

Solutions​

iOS App Store:

  • Review App Store Guidelines
  • Test thoroughly
  • Provide clear description
  • Include privacy policy
  • Respond to reviewer notes

Google Play Store:

  • Review Play Store Policies
  • Complete all metadata
  • Provide accurate screenshots
  • Include privacy policy
  • Address policy violations

Login/Authentication Issues​

Symptoms​

  • Can't log in
  • Session expires
  • Token errors
  • Social login fails

Common Causes​

1. Token Management:

  • Expired tokens
  • Invalid tokens
  • Token not stored
  • Token not refreshed

2. API Issues:

  • API endpoint errors
  • Network timeouts
  • Invalid credentials

3. Social Login:

  • SDK issues
  • Configuration errors
  • Callback problems

Solutions​

Fix Token Issues:

  • Implement token refresh
  • Store tokens securely
  • Handle expiration
  • Clear on logout

API Integration:

  • Proper error handling
  • Timeout configuration
  • Retry logic
  • Clear error messages

Social Login:

  • Update SDKs
  • Verify configuration
  • Test callbacks
  • Handle errors

Push Notification Issues​

Symptoms​

  • Notifications not received
  • Delayed notifications
  • Wrong content
  • Not clickable

Common Causes​

1. Configuration:

  • Certificates expired (iOS)
  • FCM setup incorrect (Android)
  • Device token not registered

2. Permissions:

  • Notifications disabled
  • No permission granted

3. Implementation:

  • Wrong payload
  • Handler not implemented
  • Deep linking broken

Solutions​

iOS:

  • Verify certificates
  • Check provisioning profile
  • Test device token
  • Implement handlers

Android:

  • Verify FCM setup
  • Check notification channels
  • Test device token
  • Implement handlers

General:

  • Request permissions properly
  • Test notification payload
  • Implement deep linking
  • Handle background/foreground

API Integration Issues​

Symptoms​

  • API calls failing
  • Timeout errors
  • Wrong data returned
  • Authentication errors

Common Causes​

1. Network:

  • No internet connection
  • Timeout
  • SSL errors

2. API Errors:

  • Wrong endpoint
  • Invalid parameters
  • Authentication failed
  • Rate limiting

3. Parsing:

  • JSON parsing errors
  • Data type mismatch
  • Missing fields

Solutions​

Network Handling:

  • Check connectivity
  • Implement retry logic
  • Handle timeouts
  • SSL pinning

API Integration:

  • Verify endpoints
  • Validate parameters
  • Handle authentication
  • Respect rate limits

Data Parsing:

  • Proper error handling
  • Type checking
  • Default values
  • Validate responses

UI/UX Issues​

Symptoms​

  • Layout broken
  • Wrong colors
  • Text cut off
  • Images not displaying

Common Causes​

1. Layout:

  • Constraint issues
  • Screen size variations
  • Orientation problems

2. Resources:

  • Missing assets
  • Wrong resolution
  • Color issues

3. Localization:

  • Text overflow
  • RTL issues
  • Missing translations

Solutions​

Fix Layouts:

  • Use proper constraints
  • Test all screen sizes
  • Handle orientation
  • Use responsive design

Manage Resources:

  • Provide all densities
  • Use vector graphics
  • Test on devices
  • Verify colors

Localization:

  • Test all languages
  • Handle RTL
  • Dynamic text sizing
  • Provide translations

Troubleshooting Checklist​

Development:

  • Test on real devices
  • Check all screen sizes
  • Test all OS versions
  • Profile performance
  • Fix memory leaks
  • Handle errors properly

Pre-Launch:

  • Complete testing
  • Fix all crashes
  • Optimize performance
  • Test on slow networks
  • Verify all features
  • Review guidelines

Post-Launch:

  • Monitor crash reports
  • Track analytics
  • Review user feedback
  • Monitor performance
  • Update regularly

Tools & Resources​

iOS:

  • Xcode Instruments
  • TestFlight
  • Crashlytics
  • Charles Proxy

Android:

  • Android Studio Profiler
  • Firebase Test Lab
  • Crashlytics
  • Charles Proxy

Cross-Platform:

  • Sentry
  • Bugsnag
  • Firebase Analytics
  • App Center

Last Updated: January 2026
Version: 1.0
Owner: ARUKZ DIGITAL Mobile Team

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