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If that black box is generated by Tv, it should be there all the time, like on cable, av input etc.
as you said its not always, so cable top box is suspected which can generate such box as well.
I would suggest when you see that box in tv reception, simply play dvd player and check is that box still appears on dvd input? I hope black box wont appear in playback of dvd player.
Need further help, please let me know.
I had the same problem once with my RCA television. It only happened on certain channels and didn't happen during commercial breaks. If I adjusted the volume on the tv the box went away, but came back shortly after. The problem ended up being some malfunction in the closed captioning. I turned it all off and changed the CC settings and never had the problem again.
Sounds like a digital cable issue to me. Try connecting the cable directly to the TV bypassing the cable box and I bet that the issue will be gone. If so then contact your cable provider as the box or the incomming signal may be at falt.