hey,just a tid-bit of info. if you dont want your matrix to end up in the wall, dont run it until you get the servo issue taken care of. we bought our martix and the servo twitched just like that. after about six tanks of break in, the throttle servo went to wide open and smashed us into a wooden fence! after that, the servo would go to wide open every time you turned the truck on. we replaced it with a jr that i had in my box and no more servo trouble.