Waze was running during the issues. I let it go for two days before I rebooted. Once done, no more issues. SCP location service at high accuracy, update interval 4000. So far so good, it was the first reboot after Android 11 update...I’m not that technical, maybe the phone was stuck on stupid and had to reset.
Thinking a little more about this -- the geocoding feature that translates coordinates to a street address is separate from the actual location service that gets the coordinates. There are limits on geocoding requests (the specifics are not published), but I had never run into them and I expect if that was the issue, it would display an error instead of an address.
Having one address constantly returned makes me think your coordinates are not changing, so the geocoder is working but not getting any new information. If it happens to pop up again, and you have the coordinates displayed on the main screen, try driving around to see if they change or if they are frozen.
There are some minor improvements coming to the location service in the next update; not sure if it would be something that corrected an issue like this though.