Sorry to hear about this experience. Would you mind sharing a screen recording of the problem along with the version of the OS and Illustrator installed on your computer so we can investigate this further?
Also, try resetting Illustrator's preferences by following the steps shared in this article (https://helpx.adobe.com/illustrator/kb/troubleshoot-preference-issues.html) and sharing your observations. Disclaimer: Please note that resetting preferences will remove all custom settings, and Illustrator will launch with the defaults. You may take a backup of these settings from the location mentioned in the article.