Hi there,
Sorry to hear about your experience. Would you mind sharing the version of the Illustrator & macOS? Does it happen while working on a specific file? Have you tried disabling GPU Performance under Preferences > Performance?
I see you're working on a cloud document(.AIC file). Please try saving the file as AI file on local drive and see if you get the similar behavior.
This information would help us assist you accordingly. Looking forward to your response.
Regards,
Ashutosh