Amen!!! I also turned off (removed, not just hidden) my boss' shared calendar and it hasn't crashed (for a couple minutes which is nothing short of a miracle). Thanks for sharing.
I have tried everything suggested in previous posts and anything I could fine (except resetting phone) prior to this (clear cache, clear data, uninstall, reinstall, move all mail out of inbox, 'reset' the sync on the app, clear browser cache, restart phone
(many times). There is no issue with memory or storage on my Galaxy S9. Just posting this for reference to Microsoft. There is a bug in the shared calendar access that needs to be fixed ASAP (I need access to my boss' calendar).
Thanks again!!!