I have a bedroom in our basement that had a TiVo HD (TCD652160) that started having problems tuning in channels. It would happen randomly, not all the time and different channels at different periods would just not "lock in" and be viewable. I thought it was the TIVo itself. Then, I read some posts here and thought maybe the cable card's firmware needed to be updated.
I pursued this, but Comcast informed me there was no "firmware update" to be done for my cable cards. I thought it was simply bad Comcast service and moved on. A few weeks later, I got a refurb 2-tuner premiere and stuck it in this room thinking the problem would be solved. Nope, same exact problem; random channel loss.
Therefore, I figured since it happened to both Tivos, there had to be a problem with the cable line. This has been confirmed even more as the TiVo HD was moved into the basement rec room and now there are no problems at all with it. It tunes in EVERY station fine.
While the TiVo HD was in this room, I ran a channel signal test. Was getting in the 90s on ALL channels. Same thing with the Premiere. What is even weird though is that if the channel wasn't tuning in at that moment, it would then tune in once I ran the signal strength test on it.
My other various TiVos (premieres and a Series 3 -OLED) work fine in other areas of the house too. Any ideas/theories on what may be going on here & in this one room?