I recently had the Xfinity Home Security System installed (a little over a month ago). Since then my cameras are constantly loosing connectivity and require me to reboot the alarm system. However, the door sensors do work (sometimes). There are times when the front door opens and closes and the alarm never knows that the door has opened and closed. Twenty minutes later the alarm recognizes that the door was opened and makes its audible cue. Looking at the history and the system thinks that the action of the door opened twenty minutes after had actually done so. I don't dare try this while the alarm is activated but I'm sure that the alarm would not register the door opening and closing while activated. This completely defeats the purpose of this. There are multiple reasons I got this system. 1) I travel and my wife and two childeren are home alone while I am gone. 2) When I'm not traveling I work from home, however my office is in the basement and like to have visibility of my front door. I get frequent deliveries and had wanted to use this as a way to know if a visitor is coming to the front door.
This system has yet to serve its purpose and is a constant headache to deal with. The technician has been out and moved the modem in the most central point in my house (my house isn't that big, around 2100 sqft) and I'm still loosing camera connectivity. He came back out and I've replaced the touchscreen and Its still happening.
BUYERS BEWARE THIS PRODUCT IS GARBAGE. You are better off spending more money on a fully hardwired system and monitored by people that know how security needs to be done.