After a few minutes of driving my Slash 4x4, the truck is hesitant to move. It takes 4 or more pulls on the trigger to get it going or I have to push it a little. It also makes a beeping sound whenever I pull the trigger. I tried messing with the throttle trim, resetting the esc, and everything else but it still does it. I have seen a few posts of the same problem. Is it a faulty batch of speed controls and should I send it in to Traxxas??? PLEASE HELP!