I've noticed that occasionally my IR sensor stops working, and no longer responds to changing the volume, skipping the track in iTunes, etc. It can be resolved by going into Security prefs, disabling and re-enabling the IR sensor. This is annoying, however, and I'm wondering if it's a known issue that might be fixed. I noticed that when you disable and re-enable the IR sensor, the last few remote button pushes you made while it was broken come through in a burst. Is anyone else hitting this one?