Other that an occasional reboot my 721 was just fine until last week. All of a sudden when I pressed the guide button nothing happened, every other button functions fine. I forced a reboot and the guide came back, I figured ok no biggie, but 2 hours later no guide again. Called support and was told that this is a known issue and they hope to fix with the next software upgrade, but they have no work around and can not say when the next release might happen. A pvr without a guide is about useless. I can't believe they don't have some idea of when this might be fixed. Certainly seems like it should be a major priority.