Sorry to hear about this experience. I would request if you could share a few more detail like:
You may also try resetting Illustrator preferences. Preference settings are saved each time you quit the application. Crashing and unexpected behavior in application can be caused due to corrupt/ damaged preferences. Please follow these steps and let us know how it goes:
Please note that resetting preferences will remove all the custom settings and Illustrator will launch with default settings. This way all your old settings will be saved in .old folders and Illustrator will recreate new folders with default settings.
You may also try steps shared in this help article and share your observations with us. We'd be happy to help.
We have been waiting for your response to this query. Please update the discussion if the issue is resolved or if you have any further query. We'd be happy to help.