X1 TV Box Issue

I have a main X1 TV Box in the living room and an additional X1 TV Box in my bedroom. The TV Box in my bedroom is working fine with no issues however the main TV Box in the living room is giving me issues.

Here's what the issue looks like: The living room TV will show what's on SyFy (the current channel it's on) for a minute or 2, disappear, and repeats the process showing what's on Syfy again. It's also not changing the channel when I use the XR15 voice control remote TV or Xfinity TV Remote app on my android phone.

Here's what I've done to try and fix the issue: (1) I made sure all the connections are tightened, (2) I replaced the batteries in the remote, and (3) I made sure the TV is in the correct input.
Other things I've done to try and fix the issue: (1) I replaced the HDMI with a new HDMI (a new/unused HDMI I have lying around), (2) I tried connecting the remote control I use for my bedroom TV Box to the living room TV Box and it's not changing the channel, (3) I swapped the two TVs, and (4) disconnecting the power to the living room TV Box and reconnecting it.

I've tried everything that I could think of to try and fix the issue and nothing fixed the issue. I tested the HDMI and the remote control of my living room TV Box on my bedroom TV Box and they're both working. I also tested my living room TV in my bedroom TV Box and it's also working fine. I narrowed down the issue and assumed that the problem is the living room TV Box and not the HDMI cable, TV Box remote control, or the TV.