I’ve been having trouble with the monitor of my Onefinity losing the signal while in use. It started doing it more frequently until it didn’t receive a signal at all , A “no signal” message would appear. I found out if I wiggle the hdmi that connects to the back of the controller box it would get my signal back but it is getting worse. The monitor works, the controller works. I believe the short hdmi pigtail has a bad connection.
this could be the monitor intermittent issue that is solved by placing ferrite cores on the HDMI cable, see here