Had our first lockup last night – first noticed that the remote wasn’t doing anything (just trying to call up the banner). No buttons worked at all. On the device itself, the only buttons that actually did work were the volume up/down. The 2580 remote code thing didn’t do anything.
Ended up yanking the power cable and re-booting. Was initially panicked as my recordings disappeared (planned were still in place), but they came back after a few mins! Phew!