1. Check for loose cables or power cord
Make sure that all of the cords for your phone (AC adapter, power cord, charging cable, etc.) are securely connected.2. Check for liquid damage
If you think your phone has liquid damage, take it immediately to an authorized repair shop.3. Check for software updates
Make sure your phone has the latest software updates installed.4. Check battery health
If your phone’s battery is starting to wear down, it can often cause issues with the phone.5. Check the display
If your phone’s display has been damaged, it could be causing the flashing.6. Check for other issues
If none of the above seem to solve the problem, it could be an issue with the phone itself or with parts inside it. It is advisable to take the phone to an authorized repair shop for further diagnosis.