3.2 Given a scenario, troubleshoot mobile OS and application security issues
📘CompTIA A+ Core 2 (220-1202)
An application that fails to close or crashes is a common mobile device problem tested in the CompTIA A+ Core 2 exam.
This issue can affect performance, battery life, security, and user productivity, so technicians must know how to identify causes and apply proper solutions.
What Does “Application Fails to Close” Mean?
An application fails to close when:
- The app stays open even after the user tries to exit
- The app runs in the background without responding
- The app freezes and cannot be stopped normally
- The app consumes system resources continuously
This can cause:
- Slow device performance
- Battery drain
- Device overheating
- Security risks if sensitive data remains active
What Does “Application Crash” Mean?
An application crash occurs when:
- The app suddenly stops working
- The app closes on its own
- The device displays an error message
- The app returns to the home screen without warning
Crashes can happen:
- During app launch
- While using certain features
- After an OS or app update
Common Causes of Apps Failing to Close or Crashing
1. Insufficient System Resources
Mobile devices have limited RAM and CPU power.
When:
- Too many apps are open
- Background processes are running
- The device is low on available memory
The app may:
- Freeze
- Become unresponsive
- Crash unexpectedly
2. Application Bugs or Corruption
Apps may contain:
- Programming errors
- Incomplete installations
- Corrupted files
This can happen after:
- A failed update
- Interrupted installation
- Incompatible app version
3. Operating System Compatibility Issues
Apps must be compatible with the mobile OS version.
Problems occur when:
- The OS is updated but the app is not
- The app requires a newer OS version
- The app is not designed for the device architecture
4. Permission Issues
Mobile apps require permissions to:
- Access storage
- Use the camera
- Access the network
- Run background services
If permissions are:
- Denied
- Removed
- Misconfigured
The app may:
- Fail to close properly
- Crash during operation
5. Cache or Temporary Data Problems
Apps store temporary data (cache) to improve speed.
Over time:
- Cache files may become corrupted
- Cache may grow too large
This can cause:
- Freezing
- Unexpected crashes
- Failure to close
6. Malware or Malicious Applications
Malicious apps can:
- Interfere with normal app behavior
- Prevent apps from closing
- Cause frequent crashes
This is a security concern, especially for enterprise or corporate devices.
7. Device Overheating
When a device overheats:
- The OS may force apps to stop
- Apps may crash to protect hardware
Overheating can result from:
- Heavy background processes
- Continuous app execution
Exam-Relevant Troubleshooting Steps
CompTIA expects technicians to follow logical and safe troubleshooting methods.
Step 1: Force Close the Application
If an app is frozen:
- Use the device’s app management settings
- Force stop the application
This immediately stops all app processes.
Step 2: Restart the Device
Restarting:
- Clears memory
- Stops background services
- Reloads system processes
This is often the fastest and safest fix.
Step 3: Clear Application Cache
Clearing cache:
- Removes temporary files
- Does not delete user data
This is especially effective for apps that freeze or crash repeatedly.
Step 4: Update the Application
App updates:
- Fix bugs
- Improve compatibility
- Patch security flaws
Always ensure the app is running the latest version.
Step 5: Update the Mobile Operating System
OS updates:
- Improve stability
- Fix known issues
- Improve app compatibility
Outdated OS versions are a common cause of crashes.
Step 6: Check Application Permissions
Verify:
- Required permissions are enabled
- Permissions match the app’s function
Incorrect permissions can prevent proper app behavior.
Step 7: Uninstall and Reinstall the Application
Reinstalling:
- Removes corrupted files
- Resets app settings
- Installs a clean version
This is a common exam-approved solution.
Step 8: Check for Malware
If crashes continue:
- Scan the device with security software
- Remove suspicious or untrusted apps
Malware can cause repeated app failures.
Step 9: Reset Application Preferences (If Available)
Some devices allow:
- Resetting app preferences
- Restoring default app behavior
This does not delete data but fixes misconfigurations.
Security Considerations (Exam Focus)
CompTIA A+ emphasizes security awareness.
Technicians must:
- Remove apps from untrusted sources
- Ensure apps are updated
- Limit unnecessary permissions
- Prevent apps from running uncontrollably in the background
An app that fails to close may:
- Expose sensitive information
- Drain resources
- Create security vulnerabilities
Key Exam Takeaways
For the CompTIA A+ Core 2 exam, remember:
- App crashes and failure to close are common mobile OS issues
- Causes include:
- Low memory
- App bugs
- OS incompatibility
- Cache issues
- Permission errors
- Malware
- Common fixes:
- Force stop
- Restart device
- Clear cache
- Update app/OS
- Reinstall app
- Security awareness is critical
