U Verse Wireless Receiver works in every room of the house except the living room

For years we had our TV set up on an interior wall of our living room. We decided to flip our layout and hang the TV on the opposite wall, which is an exterior wall on the end of our house. The wiring comes into the house on the opposite end of the house, so rather than run the wiring under the floor or through the ceiling to the new installation we opted to pull the wireless receiver from the master bedroom and install the RG and primary receiver in the bedroom, which is directly over the entry point to the house and much more convenient. 

The amount of distance between the RG/WPS and the wireless receiver increased by about 15 feet of airspace, but aside from that nothing changed. For some reason, though, the wireless receiver would get stuck in a reboot loop whenever it tried to connect to the WPS point. Here is the troubleshooting I did:

1) Left the wired setup in the bedroom, pulled the wireless receiver into the BR and checked connectivity on that TV. Worked fine. At this point I thought maybe the 15 feet of distance was a factor

2) Re-installed the wireless receiver in the living room on the end wall of the house, pulled the wires back into the living room where it was originally installed and connected the gateway and WPS there. Wireless gateway did not work. 

3) Just for kicks, I left the RG/WPS in the living room and installed the wireless receiver on a TV in the media room on the basement level. Worked perfectly. At this point I was ready to set it on fire. 

4) Because I love punishing myself, I pulled the wire BACK into the bedroom and installed the RG/WPS there, leaving the wireless receiver in the room directly under the living room. This increased the overall distance from the gateway and introduced another layer in putting it on the bottom floor below grade. it worked fine. 

So at this point I have determined the wireless receiver works in every room of the house except the living room. It simply will not configure there. It gets hung up on the U-Verse screen. The loading indicator freezes and then it reboots. The wireless receiver should configure independent of the TV it is connected to, and the primary receiver worked just fine on that TV and HDMI cord anyway, so I don't believe it's an output device issue. 

My question is, what else could it possibly be? Literally all I have done is moved the TV from an interior wall to the interior surface of an exterior wall. There is no AC unit on the other side for interference, and the connections are all above grade.