I have an Smaxx and I am new in this hobby, only been running for 3 months. The other day I ran 2 tanks of fuel through my truck with no problem, but on the 3rd tank after hitting a small set of bumps the truck slowed right down and stalled. When I started it back up the truck would rev quite high before starting to move. Now it only runs about 5mph or not at all. Anyone have a solution?? Thanks