I think I had faced this issues too but few a time and ignored it just a general bug. hope this is fixed later these years because recently I didn't noticed it.

Hello there, I think i got some solution for you as your are facing some problem inhere. Here a two type of article differently hope this will suites to your problem and provide the suitable solution. https://www.softakensoftware.com/blog/fixing-mac-outlook-not-syncing-with-exchange-server.html https://www.softakensoftware.com/blog/outlook-not-responding-error.html I hope yo get your solution wisely. Thanks