TV Box Drops Signal

We recently got a new TV; we had also upgraded our Xfinity box about 2 months ago. We are having an issue with the TV losing the signal from the Xfinity box. The reason I think it is the Xfinity box is because we also have direct TV and it is not dropping the signal I have tried different HDMI ports on the TV, and it is still not staying connected. I tried changing the cable, I also added a power filter to make sure that the box wasn't seeing any voltage spikes. The old power strip had a surge protector built in the new one didn't so I added the filter. It worked for a long time when I added the filter. Before that it was disconnecting about every 45 minutes. But today when it dropped the signal it started looping and trying to reconnect. It was so bad I couldn't even use the remote to change the input. I unplugged the TV and was able to get back to the home screen long enough to switch the input back to the HDMI channel that the Direct tv was plugged into so we could get back to watching the tv. I am thinking there must be something wrong with the new xfinity box.