I just did a quick search and I haven't seen this mentioned here before, but I have been having an issue on my 722K for a few weeks now. I am running in Dual Mode, and whenever I hit the guide button on TV1, there is a 3-5 second delay before the guide comes up. Once I am in the guide, the page up/down buttons also have a delay. The DVR button does not have this problem - it responds just as fast as it always has. Also, there is no guide delay on TV2, just TV1. Any idea what could be causing this?