all my servos are twitching i have a Dirt demon w/ stock rx tx and servos .It only happens when i run my truck .ill be cruzin along and then all of a sudden they will start twitching and then ill gain control again for a moment and then bam!!! there they go again .I have gone though eveything and i can't think of whats happening. it has charged rx batt"s fresh tx batt's the fail safe is working good and i even checked the switch.any ideas would be a great help.it doesn't to it when I'm sitting on the bench working on it . only when I'm running it.