I have no idea how this one was triggered.
Error communicating with service host
There was an error reading from the pipe: Unrecognized error 109 (0x6d).
This can happen when the services are shut down, for example when upgrading, if the agent is busy talking to the server when the server is upgraded. We have been looking for ways to mitigate this, however there’s no simple way to detect an ‘in flight’ wcf call.