I have a TIVO Roamio. Some of my channels stopped work, but most still work. Called TIVO, they had me run tests and said the SNR was low and something about modulation (?) and I should call the cable company. Cable company refreshed signal, that didn't help. They sent repairman. He couldn't get it to work and recommended rewiring. My son ran a cable from one of the working TVs to the TIVO box and the channels that had stopped working still didn't work. He said the problem is the TIVO. I have a lifetime service on this and hate to give it up. Also, at the same time, the fan has started making noise - not terrible, but noisy. Does it sound like something worth repairing? Thanks for your suggestions.