Xfinity Home Touch Screen Controller keeps beeping, warning of "interference."

We’ve had Xfinity Home security for over five years. Unfortunately, during the past two years the Touch Screen Controller has been intermittently beeping, warning of "interference." Typically it will keep beeping until you go to the touch screen and cycle through several messages warning of the interference.

An Xfinity field tech made a house call last fall to try to remedy the problem. They ended up relocating the Touch Screen Controller to a different room in our house and changing a channel on the Touch Screen Controller (something they said only could be done onsite by an Xfinity tech). That fixed the problem until recently when, alas, the Touch Screen Controller started beeping again.

Sometimes the beeping seems to be in response to our opening an sensored door, sometimes it will just start beeping for no apparent reason, and it’ll keep beeping for an hour or longer until you go to the Touch Screen Controller and cycle through the ambiguous messages again.

Two weeks ago we relocated the Touch Screen Controller to different room, and there it behaved for about two weeks, only to start beeping again. So what can we do? The Touch Screen Controller says nothing about the nature of the interference, nor does it specify which sensors (we have four) is being interfered with. The Xfinity field tech had no idea what was causing the interference, nor did he have any tools for identifying the source of the interference. At the very least we'd like an option to silence the beeping short of having to cycle through the Touch Screen Controller screens each time, but Xfinity told us there's no volume control for the beeping. What’s to be done?

Any suggestions? Thanks.