Samsung TV not recognizing Xfinity box

I have a Samsung Smart TV bought beginning of 2020.  I had hooked it up to Xfinity wireless box Xi6A, and it worked fine.  

However, now all of the sudden I can not get the TV to play cable channels.  I have no problem playing Netflix, Amazon Prime, etc…BUT, it does not recognize the cable box in the HDMI 1.  I tried to move to HDMI 2 and still same problem. 

I have done a hard reset, unplugged everything and then the cable worked…. But as soon as we turned it off and tried again, same problem….not recognizing the HDMI 1 and allowing us to watch cable.

Any thoughts/suggestions?  Thank you!!