Same issue with Finder. Disabling iCloud/Apple ID. Haven't turn it back on yet! It just started out of the blue, I have already been running 11.2.3 since it was released… I am really regreted I upgraded from Catalina at the end of last year. Also some other minor (yet annoying) issues with some apps also not opening/unresponsive since the upgrade… Trackpad loosing bluetooth connection quite often as well.
CuriousMacintosh
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