Hello everyone, I currently have a TiVo HD. About two weeks ago I “lost” about 70% of my HD channels. I have one TV with both the TiVo HD and a cable box hooked up into it. All the HD channels are coming thru just fine on the cable box. However, when I try to access some of those same channels on the TiVo HD one of two things happen: 1) I get the video and audio just fine and then after 3-4 seconds it just freezes. I’m able to fast forward to catch up to “live” TV but after 3-4 seconds it will freeze again. 2) I get audio but I get a grey screen so no video. No freezing on the audio. Just no picture. The same thing is happening to my recordings. For the HD channels I get they work just fine. The recordings for the HD channels I no longer get behave the same as “live” TV. I initially thought it was a glitch that would work itself out. However, that was not the case. Since I was getting some HD channels just fine (CBS, ABC, etc, etc) and not others (CNN, FOX, etc, etc.) I started to believe that the problem was with the cable card. I’ve had that cable card for about 5 years or so and thought that maybe it was dying. I contacted Comcast and asked them to mail me a new cable card, which they did. When I called Comcast to have it paired to the TiVo I was able to accomplish that fairly easily. However, when I was done the lady I was dealing with at Comcast asked me to check and see if the HD channels I couldn’t get before were now available. To my surprise they were not. At that point the Comcast lady I was dealing with told me that she wasn’t surprised. She informed me that this is a common occurrence with older TiVo’s. According to her it has something to do with the format in which the HD channel signal is being broadcast in. I remember reading something about that a while ago on this website but at that point it seemed like it was years away. I tried looking for the forum entry on this but couldn’t find it. Can someone explain the specifics to me of what is happening? Also, if Comcast decides to broadcast all the HD channels in this new format am I correct to assume that my TiVo HD will only be good for SD channels (SD channels work fine and record fine)? Ultimately, I’ll be fine. I purchased a brand-new Bolt + in October of 2016 (w/lifetime) in case the TiVo HD died which I’ve never opened. I assume this issue won’t occur with the Bolt +. One last question: I’m not very techy so please excuse the question. My understanding of cable cards is that a single stream card can accommodate one cable channel (HD or SD) and that a multi-stream cable card can accommodate two cable channels (HD or SD). In discussing my situation with the Comcast lady I mentioned to her that it was good that I had two multi-stream cable cards as I believe that the Bolt + could record 4 TV shows at the same time. She stated that I didn’t need two multi-stream cable cards to accomplish that. I only needed one. Is this true? Can one multi-stream cable card accommodate four cable channels (HD or SD)? Lastly, thank you for taking the time to read my post. I’d be very grateful for any information or insight you can provide.