The Airport on my well-used TiBook has very recently started getting very iffy. It'll completely lose the signal for several minutes on end, get it back for a little while, lose it again. It has nothing to do with my distance or line-of-sight to the AP; it's happened when I wasn't touching the TiBook and it had a *perfect* under-10-feet LOS to the AP. One second I'm online, the next it can't see any wireless signal at all. Anyone know what's going on here?