The onions are working fine (I’m writing on it)
The server is experiencing periodic hardware issues (which are known about with the provider, they are working on a solution).
The hardware issue causes CPU lockups which causes Tor, and other things, to go out of whack a bit.
An existing Tor v3 onion bug (not our bug, but a bug in Tor, expected to be fixed in stable in December) then results in the .onion failing to re-publish its descriptor to the HSDir for a while, but this issue clears itself after some time.
Nothing I can do about it I’m afraid. Soon we will hopefully migrate to a new server. Since the server is being provided in-kind (I think), we will need to be patient 