It’s unclear exactly what the problem is, but several people are experiencing issues with the tap-to-wake feature. Reports of the bug are popping up on Reddit, on Apple Support, the MacRumors forums, and in various tweets on Twitter, with no official response from Apple yet. Sometimes, simply pressing the power button to “wake up” the phone is enough, other times a full restart is necessary.
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Reddit user paranoidaditya says tap-to-wake on their iPhone 13 hasn’t worked consistently since launch, and installing the iOS 15.1 beta hasn’t helped. However, other Reddit users like Twintale say their touchscreens won’t react after unlocking via Face ID.