Check out our NEW iPhone Settings to turn off now. Start the video in the web app. 8 Iphone Settings You Should Never Turn Off Youtube In 2021 Iphone Information Iphone Turn Ons I cant recall this ever happening before. Why does my screen turn off while watching videos iphone . Screen dims then shuts off while watching video. It may be related to the poor hardware performance of your computer outdated graphic drivers or flash player issue that does not support the high quality videos you are trying to play. If the video that youre watching includes audio descriptions. The reason your iPhone keeps dimming and turning off is because of a feature called Auto-Lock which automatically puts the iPhone into a sleeplock mode after a certain period of time. With iOS 14 or later go to Settings Control Center and tap More Controls or tap Customize Controls if you have iOS 13 or earlier then tap the Add button next to Screen Recording. Even an unsafe third-party software can create sy