Hi there! I'm Charlotte Green, here to help you out. I understand it can be concerning when your Mech Arena app keeps crashing, your device overheats, and it even turns off. Let's try to address these issues step by step.

Here are some actions you can take to resolve these issues:

1. Clear Cache and Data: Sometimes clearing the app cache and data can resolve crashing issues. Go to your device's Settings > Apps > Mech Arena > Storage > Clear Cache and Clear Data. Please note that clearing the data will reset the app to its default state, so you might need to log in again.

2. Reinstall the App: Uninstall the Mech Arena app from your device and then reinstall it from the Google Play Store. This can fix any corrupted files that might be causing the crashes.

3. Lower Graphics Settings: Sometimes, high graphics settings can strain your device's CPU and GPU, causing overheating and crashes. Lowering these settings within the game might help resolve the problem 3.

4. Device Maintenance: Ensure your device has enough storage and isn't running too many apps in the background. Overheating can occur when your device is overburdened.

5. Update the System and App: Make sure both your Android OS and the Mech Arena app are updated to the latest versions. Updates often contain bug fixes and performance improvements.

6. Uninstall Google Accessibility Suite Updates: Some users have found that uninstalling updates from the Google Accessibility Suite can help with overheating issues. You can do this by opening Google Play Store, navigating to 'Manage Apps,' finding the Google Accessibility Suite app, and choosing 'Uninstall Updates' 7.

Please try these steps and let me know how it goes. Are you satisfied with the solution I provided, or do you need further assistance?