I would suggest trying a different keysniffer and see if the problem persists.
if the problem still occurs with a different keysniffer, then we can rule out the keysniffer as being the source of the trouble, and can begin to look at udp conflicts and other network issues.
however, if the problem goes away, we will have narrowed it down to mag 2.04-5 so we know where to look. it seems like everyone reporting the problem is using the same type of sniffer.