Diagnosis
Yeah, this one's common. The monitor is losing its wireless link to the camera, triggering a 'connection lost' alert. It's not random; it's a signal issue.
How to Fix It
First, check the camera's power light. If it's off or blinking erratically, the camera lost power—reseat its power plug. If the camera light is solid, you need to improve the signal. Move the parent unit closer to the nursery to see if the beeping stops. Common interference sources are 5GHz Wi-Fi routers, cordless phone bases, microwave ovens, and thick walls. Try changing the monitor's channel. Go to Menu > Settings > Channel and manually select a different one (like Channel 2 or 3).
If That Didn't Work
The constant beeping can also be a low battery alert if the parent unit isn't seated correctly on its charging dock. Clean the charging contacts on the back of the monitor and the dock with a dry cloth. Make sure it's clicking into place.
Heads Up
Don't ignore this. If the signal is consistently poor, the video will cut out too, which defeats the whole purpose. A permanent fix might involve relocating the camera or its power adapter to a different outlet.