TV Black Screen keeps happening randomly

I keep getting a random black screen that I can fix with the TV Box reset under Support Troubleshooting for black screen.  That problem is this black screen issue is happening randomly about every few weeks.  Now it's happening about once a week.  The sound remains on.  It's not my Amazon Fire TV because I can watch apps on the TV that are outside Xfinity service.  It does not appear to be the HDMI or the cable connections because the Satellite Box reset for black screen through the Xfinity website fixing it for awhile.  Is my Satellite box giving out?   I've had the box for 2 years.  Sadly, my local store is not the most helpful and I do not want to go through the trouble of disconnecting the box and taking it to them unless I know that the box is the problem and they will replace it for me.  I've called the support phone lines and cannot get beyond the automated system.  What is the best way to get this resolved?  Thank you.