Touch screen interference: Zigbee versus Wi-Fi?

We've had Xfinity Home for about 10 years. While in general we've been pleased with it, for the past several years the touch screen has been annoying us by intermittently beeping, warning that it has detected some "signal interference." In order to get it to shut up we have to work our way through its menus and acknowledge the warning. These beeping episodes happen several times every day.

Xfinity tech support seems baffled. About a year ago a field tech came out and changed a channel on the touch screen. That solved the problem--for about 3 months--and then it started beeping again.

I've done some research and learned that the frequencies used by the touch screen (known as Zigbee) use the same frequency spectrum as Wi-Fi; this makes me wonder if there is overlap between the two causing interference? Could maybe configuring router Wi-Fi channels and the touch screen channels help the two to get along?

Unfortunately, I'm not convinced the Xfinity tech people understand the technology well enough to take this approach (it's maddening enough that every time a field tech comes to our home they have to take time calling the office to figure out why the original installers of our Xfinity Home added a dedicated modem to the system--in addition to the Xfinity modem/router). I've been told several times in phone conversations with Xfinity that the field techs have tools that can identify sources of signal interference, however no field tech we've talked to has ever acknowledged having such a tool.

Any suggestions? Thanks.