Unable to change channel, picture from one channel stuck

I hope I explain this well enough - the remote works, and as the channel is changed, with the up/down buttons or through the Guide, the lower third will show the new channel, info, everything.  Sometimes, you can even hear the audio of the new channel.  But the picture never changes.  Today it was FS2 stuck on the screen as I just kept hitting channel up, and the text would keep changing along with my button pressing.  Voice commands wouldn't work - said my main box was offline.  Used the app to reset the box, which worked and has worked before, but the issue just keeps happening randomly.  Wonder if anyone else has seen this particular bug.