In this case, ours was caused by the installation contractor's error when installing the takeover equipment. He should have replaced our old vendor's wireless door sensor and wireless card in the control panel with XFinity equipment. He didn't, so the old wireless setup was causing our takeover equipment to throw an "unknown error". Once an in-house Xfinity technician came out, he diagnosed and corrected the problem right away. No issues since then.
BTW, for anyone considering an Xfinity Home installation, *ALWAYS* insist that an in-house Xfinity tech come out. The subcontractors that Xfinity/Comcast use are worthless IMHO. Whether it's been cable, internet, or home, I've never had a good experience with the subs. This last sub actually had to FaceTime with his boss the entire time he was at my house to talk him through the conversion, and they still got it wrong. Thanks goodness for the in-house Xfinity tech!
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