Not really an answer, but I have similar issues in VS 2022 Professional, mostly with 'ServiceHub.IdentityHost.exe'. Killing the thread from TaskManager helps to resolve it (it comes back up, takes 100% CPU for a second or so, then goes back to 0%). The same with 'ServiceHub.Host.dotnet.x64.exe'. I have 2 Visual Studio accounts that seem to be associated with this problem; one account needed refreshing (entering the password; "Re-enter your credentials") and then my issues with 'ServiceHub.IdentityHost.exe' seemed to go away, but the dotnet.x64.exe variant also acts up now.