Perhaps I spoke too soon. The occasional instances where one channel lower comes on (what I referred to as "spikes" in the first post) have definitely been fixed with the 12-2010 firmware. I still seem to be having lockup issues. It happened yesterday when there was no DMX being transmitted (or at least being changed) so I thought that might be it, but then I had lockup tonight during the show during one of the songs. I have 1 wired LE before the transmitter and it keeps on chugging along happily. It also seems like it has to be the transmitter because both of the wireless LEs stop responding, however just as before, if I only power cycle the TX, it doesn't correct itself, it takes power cycling the whole display to get it back up again.
Tomorrow I'll try Uni 3 just for giggles, and if that doesn't do it, I'll run wires this weekend just to verify that it is indeed the wireless causing problems.