After some bad luck with my 721 (the early ones had to get returned for hardware defects), my 721 has been working reliably for a couple of years now. Only the occasional reboot needed. But lately, I've been getting momentary (just a few seconds) of interruption of the signal - causing the screen to freeze momentarily or switch to the "acquiring signal" screen for a second -- then back to normal as if nothing had happened. Is this a sign of a developing problem? Is there any adverse alignments of the satellites w.r.t. the sun right now? Dish problem? When I've noticed the interruption - its been on the local channel feed. I believe the 721 did have some tuner problems early, but this unit has worked pretty flawlessly for over 2 years now. Any ideas out there?