I had much the same problem. Also, when the tv was turned off for the night, then on again in the morning, nothing would happen., which resulted in us having to reboot the tv box (little flat black box). This happened time & time again. We not only had a problem with the living room box doing this, but also in our daughter's bedroom. Our bedroom tv was doing just fine. We put out a call for tech support, & the technician brought with him, some tv boxes just in case they needed to be replaced. The result was that he replaced the box for the livingroom tv along with the HDM1 cord. Correction for the problem with the bedroom tv was the replacement of the HDM1 cord. The tech went on to state that had the problem not been with the tv box or the HDM1, then the culprit would have been the tv's.
Needless to say, we were glad to know that replacing the tv was not necessary;, but also we wouldn't have done so, but rather lived with rebooting.
Have the exact same problem. Need to unplug the box to get it to work. Have also posted the problem on this forum. The problem cannot be the TV as the screensaver comes form Rogers, the TV only displays what signals it gets. I have had issues (with sound cutting out and picture keeps on and picture freezing but sound continues) and when they are stumped, they also replaced my sett top box and cables but I still have problems.