When the game is closed the Nintendo Switch crashes and you have to force Power off the device. Its been going on since the 1.16.20 update came in.
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Duplicate of MCPE-95621. Please search in the future if you haven't already.
Literally the same thing been happening to me. The game freezes, won't connect to internet, i try closing minecraft and my switch crashes so I have to power it off. Didnt have this issue til the 1.16.20 update