After upgrading to Illustrator 25.0 the application unexpectedly quits when I try to quit the application normally. AI preferences are lost and all changes have to be made again.
Yes, I have tried the prefs reset multiple times.
Sorry to hear about your experience. Please update your app to the latest version(v25.1). Let us know if it helps.
Additionally, you may follow this community post(https://community.adobe.com/t5/illustrator/resolve-slow-performance-and-unexpected-behaviors-in-illu...) to resolve such issues.
Hope it helps.
Updating to 25.1 did not solve the problem. Still crashes when quitting. You should find crash reports under user "dmechling..."