Twice now in the past several days my TiVoHD XL has gotten into a state where it is incredibly slow to respond to the remote. It's not the remote -- I've changed the batteries and also used a second remote I have lying around. When it's in this state, the yellow light doesn't light up when I press a key on the remote. Maybe it'll register one out of 20 keypresses (when it does register, the yellow light lights up). It still records fine when in this state. It's connected to cable (RCN) with two S-cards. I've had the machine for several weeks, so it's not the "new machine is slowed due to indexing" thing. And if I reboot, it'll be fine for a few days and go back into the bad state. Any idea what's going on or how to fix it?