Since my last problem I incurred I thought was related to the 721 but it was actually my TV, I am not sure if this is a problem with the 721 or not. I have found that since the last software update, my 721 is extremely slow if bringing up the PVR menu and making any choices from the menu. It may take 5 to 10 seconds for it to scroll through each of the items on the recorded program menu. It is even slower if the unit is taping a program at the time I am trying to view the list. Sometimes it takes 2 or 3 tries of pressing a button for the unit to do what I am actually requesting. All the time, the hard drive is very busy making noise as it is trying to load data. The unit still has over 50 hours of free time and I have tried rebooting the unit without any improvement. Is this a common problem or is it something I am doing.