Sorry to hear about your experience. Would you mind sharing exact version of the Adobe Illustrator? Does it happen with a specific file or all?
Have you tried resetting preferences? If not, please try steps given below to do that:
Close all Adobe applications.
Go to locations
Rename Adobe Illustrator, com.adobe.illustrator and Adobe Illustrator 24 Settings folders to Adobe Illustrator.old, com.adobe.illustrator.old and Adobe Illustrator 24 Settings.old
Launch Illustrator from the Creative Cloud.
**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.
Let us know if it helps. Looking forward to your response.