MBP36S - audio only; no video

My MBP36S baby video monitor has stopped working properly. The parent unit tells me that it is paired with the camera unit (and won’t let me remove the camera to try to pair again) and the units are connected for audio, in that I can use the audio only function on the monitor. However, the video function has just stopped working. I have tried resetting both units 100s of times (removing battery; unplugging, etc.) to no avail. Please help!!!