Sorry to hear about your experience. Does it seem to crash at random or after a particular action? I would request if you could share the crash report by following these steps ( https://helpx.adobe.com/in/illustrator/kb/crash-next-steps.html ).
While submitting the crash report please use the same email address, with which you are signed in on this community. This will help us find the crash report and help accordingly.
Once done, please try steps suggested on this help article (...