The Plugs and a few other items had a service outage a little over a week ago on 11/30/22. It was reported at 5:49 PM PT that day in the service status update and a post here.
Newer Plugs did recently have a firmware issue that made them drop offline, but that issue has since been fixed. Unfortunately this more rare issue looks just like that issue.
Hopefully we will be free of issues for some time to come now.