Sorry to hear about your experience. I would request you to share a few more details like:
OS and version of Illustrator
Does Illustrator starts not responding, or unexpected error occurs while working on a specific document? If yes, could you please share the document with us? You can upload it to the Creative Cloud (https://helpx.adobe.com/in/creative-cloud/help/share.html) and share the download link.
Where are you saving the files (Network Drive/ System HDD/ Shared Folder on System/ External HDD)?
When did this start happening? Are there any recent changes made to your system? For example, any antivirus, system updates, plugins, or web extensions installed recently.
Disclaimer: 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.
We are here to help. We just need more information.