Thanks for reporting this issue, Illustrator team really appreciate this.
Unfortunately we are unable to reproduce this issue in house, Kindly help Illustrator Team to nail this issue down further:
Kindly provide the exact preferences you are using and the data from below mentioned location .
Mac:- /Users//Library/Preferences/Adobe Illustrator 2X Settings
Win:-C:\Users\\AppData\Roaming\Adobe\Adobe Illustrator 2X Settings
Share the above information with us at ShareWithAI@adobe.com in a Zip file. Please mention the title of this issue as the subject of the mail.
Thanks and Regards
An error occurred while saving the commentJackie commented
Glad I finally found this comment section, but very, VERY disappointed at the fact that so many are having my exact same issues with Illustrator CC 2020. I spend way too much of my time dealing with these issues that it has put a big strain on my productivity. I don't know if any others experience this either, but I also have issues with my Mac shutting down all the time if I have both Photoshop and Illustrator open at the same time. And it's almost a given that if connected to Safari or any other, my machine will most certainly shut down and restart. I'm losing precious work time because of all these issues. I've always been a huge Mac fan but this is just plain unacceptable, especially since, as someone wrote in a previous comment, now we pay monthly fees, and not small. Very, VERY unhappy customer here.