Hi there,
Sorry to hear about your experience. Would you mind sharing version of the Illustrator & OS?
Have you tried resetting the preferences? If not, please try that and let us know if it helps.
**Please note that resetting preferences will remove all the custom settings and Illustrator will launch with default settings. You can also take a backup of the folders in case you want to. Location is mentioned in the article.
Looking forward to your response.
Regards,
Ashutosh