I had the same issue in my m2 air. I rebooted the device and everything went back to normal. Haven’t had any issues afterwards. This was about 4 months ago.
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Looks like a software issue and not hardware so I wouldn’t worry about it
I’m having similar issues every once in a while after coming from sleep. It’s just a software bug. Usually closing and opening lid again after couple seconds or restarting Mac is working. So far I haven’t seen any other hardware related issues. You can sleep just fine 😉
Sand from MacOS Mojave
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