Slow response with X1 Remote

We have been having a problem with slow (or no) response when pressing buttons on the X1 remote.  This happens on the Main TV with DVR and on other TVs with a mini box.  We have gone through battery changes, resets, etc.  It works for a while then the problem returns.  This is all at our house in FL.

We have a cottage in MA with a separate Xfinity account.  Same model DVR and remote.  Went 3 months without a single problem.

Returned to FL, and problem was still there.  Swapped out the DVR box, but the problem was back within a day.  One new issue is that the Xfinity box reboots itself once a day at around 4:00 pm.  However, the major annoyance is the unresponsive X1 remote.

Thinking about it, it seems the problem started around the time I upgraded my internet to gigabit speed and the XB6 Gateway.  Could there be any connection?  Should I update to the XB7 gateway?  Any thoughts?

By the way, the MA location has an Arris modem that I own, not an XFi gateway.