UserHost.exe error messages on our unattended bot

Hello - Today I found the errors below when I logged to our production windows server hosting a couple unattended robots, all related to UserHost.exe:


Has anyone seen this before and know what they are about? since seeing these errors, we got a “Could not connect to UIPath Robot Service” message on the robot tray and were only able to resolve by rebooting the server.

Any guesses on what may be the issue?

Thanks,
-Jaime