Started Saturday. It seems that Google is randomly deindexing and then reindexing URLs. This is includes well known sites as well.
Was reported on Twitter and John Mu from Google responded
Sorry -- We had a technical issue on our side for a while there -- this should be resolved in the meantime, and the affected URLs reprocessed. It's good to see that the Inspect URL tool is also useful for these kinds of cases though!
https://twitter.com/JohnMu/status/1114486110284124160 -- John Mu's statement
Thread about it: https://www.seroundtable.com/google-...dex-27369.html
This looks to be continuing and so far has not been corrected.
Are others here facing similar problems?