I have a Premier 4 that is a few weeks old and I have just now started to really get the time to watch some shows from Comcast On Demand. The problem is, about 80% of the time, I get some sort of error saying to try again or contact Comcast and I cannot access the show that I am trying to watch even though it is from a channel that I have access to. There is no consistency as to specific channels or shows. Usually it does not work but sometimes it does. Naturally, I contacted Comcast about his three times and all 3 times I was given the run around and told that the M card is provisioned correctly and that it must be a problem with the TiVo. If anyone has any information on this issue, or has had a similar problem and found a solution, please post back. I remember reading a thread a while back about people having their On Demand not work at all and a Comcast rep here on the forum fixing the issue, but I cannot find the thread and my issue isn't the same as it works sporadically.