You may notice that sometimes the Core2 device may not power off when the button is held in for five seconds.
I have noticed that the Button used for power is prone to breaking (I have already notified M5Stack about this issue on multiple occasions)
You can replace the switch, but a simpler fix is to use the "battery paper trick" and stick a small block of insulated substance on top of the switch to hold the cover down.

I haven't included pictures as the switch is so small and difficult to photograph.

P.S. This doesn't just affect Core2 devices, and any device that uses this switch may suffer.
Thank you for taking the Time treadad.

Adam Bryant
Forum Admin Team and Unofficial documentation and guide creator.

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M5Black, Go, Stick, Core2, and so much more, it can't fit in here!

Thanks for the heads-up, Adam. I’ve run into the same issue a couple of times and thought it was just me not holding the button long enough. Good to know it might be a hardware fault. I’ll give the battery paper trick a try and see if that helps. Appreciate you sharing the workaround and letting M5Stack know, hopefully they address it in future batches.