I watch a lot of shows and movies on my iPhone. Recently I upgraded to the iPhone 15 Pro Max. While watching Netflix, and only Netflix (not Max, YouTube, etc) my screen will flash as if I've taken a screen grab. I have done a lot of troubleshooting to see why this flashing happens. It happens whether or not the phone is being charged, has a full charge, or is plugged into an outlet (with or without another electronic or appliance is also plugged in). Any ideas?