"Connection timeout" errors on 3040 ThinOS 2205 while users working

Hi all, since we updated our Wyse 3040 thin clients to ThinOS 2205 we have started having users report they are randomly kicked out of a remote session with the error "connection timeout". Anyone else had this?

There seems to be no pattern at the moment, but we are investigating a suggestion that they all had iPhones plugged in to via USB at the time it happened. Will report back if that is real or a dead end.