iPhone 16 pro max is automatically turning on and off while using.

If your iPhone 16 Pro Max is unexpectedly turning on and off while in use, it could be due to a number of reasons including a faulty battery, software glitches, overheating, physical damage, or even a corrupted iOS update; first try a forced restart, and if the issue persists, consider checking for software updates, backing up your data and restoring your iPhone to factory settings, or contacting Apple Support to diagnose potential hardware issues. 

Here are a few steps you can take to troubleshoot:

• Force Restart:
• Press and quickly release the Volume Up button, then the Volume Down button, and finally, press and hold the Side button until the Apple logo appears on the screen. 
• Check for Software Updates:
• Go to Settings > General > Software Update and install any available updates. 
• Check Battery Health:
• Go to Settings > Battery > Battery Health to see if your battery is significantly degraded. 
• Check for Physical Damage:
• Inspect your phone for any visible signs of damage like cracks or dents on the body. 
• Cool Down Your Phone:
• If your phone is overheating, let it cool down before using it again. 
• Reset All Settings:
• Go to Settings > General > Transfer or Reset iPhone > Reset All Settings. 
• Restore from Backup:
• Back up your data to iCloud and then restore your iPhone to factory settings. 
• Contact Apple Support:
• If none of the above solutions work, contact Apple Support to discuss further troubleshooting steps or potential hardware issues.