Have you recently bought TrackIR 5 and had some very peculiar problems with it? Or is your TrackIR 5 serial number something between 152000 - 152914? Then take a look at Naturalpoint.com
forums and get your TrackIR replaced ASAP!
Sincerely
TrackIR 5 #152884 owner
(This post is useful if even one unlucky person gets his TrackIR replaced.)