Ever since getting the L175 "update" my 721 started doing the following: - Spontaneous reboots anytime it feels like it (even during recordings). - If I scroll through the guide at around 6:30 - 7:00 am the unit will reboot! 100% reproduceable. - The skip back button refuses to go back any further than the first 10 seconds -- this is usually happening during playback of recorded events. - The audio and video go out-of-sync on recorded shows if you skip ahead. The only fix I have found for this is to totally exit out of the recording and then go back in and resume where I left off. These are just "new" problems with the 721, I have others that have been long-standing and as yet unresolved by Dish. I am on my 6th 721 since 8/02 -- I considered the 522 "upgrade" but I see that has its own share of problems, not to mention the upfront expense to me.