Reading the official forums, it seems like this is mostly affecting people with the MS Store version of the sim. I don't see many reports from Steam users. I'm on the Steam version, installed the mandatory update, and have had no trouble with shutdowns. Also, some are reporting that changes in Marketplace content (adding, removing, or updating) have preceded the shutdown issues. According to reports there, people are experiencing it with fresh installs and empty community folders, so it doesn't seem to be addon-related.
You can go to the bug reporting section in the official forums and upvote the topic. Maybe that will prompt a bit of attention.