Hi Daryl,
Sorry to hear about your experience. Would you mind sharing some more details like:
1. Version of OS and Illustrator.
2. Does it happen with a specific tool/action?
3. Do you work on documents saved on a local drive or network?
All this information will help us understand the issue better and help you accordingly.
You may also try resetting the Illustrator preferences once. Please try following the steps on help article
https://helpx.adobe.com/illustrator/using/setting-preferences.html#setting_illustrator_preferences
**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.
Let us know how it goes. Looking forward to your response.
Regards,
Ashutosh