I just tried pairing my Xfinity XHS Door/Window Contact Sensors (Model XHS2-UE) without success. I have successfully paired these guys about 5 times prior to updating my hub to 126.96.36.199. I thought I might have a dud, so I tried another sensor and still no luck. I saw there was a .130 update, so I updated to the latest version, and still no joy. I tried the new search for specific device, setting the generic zigbee CS (with temp), but this didn't help. I reset the sensors to factor defaults and this did not help. The sensors are about 1 foot from the hub. The previously paired contact sensors are still functioning perfectly.
Edit: Rolled back to 188.8.131.52 and tried a third sensor without success.