Got a wmo that keeps locking up, starts off with small freezes, like for a second, then a hard lock up and i have to plug it out and in again to get it going... is it a known problem? i have had like 5 of these mices abd this is the first one that it has happened on... had it for like 3 months with no probs, started all of a sudden in windows, happens more frequently as time goes by...