Okay, I ran my truck in a park with a friend who has a new ST2. My once I hit mid throttle, it sticks and won't stop. Now my buddy's ST2 did the same thing. His hit second gear and never looked back. When he got to the truck the throttle was stuck on wide open. We took the truck back to our supplies and when he turned it off and then back on, the servo moved the throttle back to the starting position. We both were running brand new batteries from different stores.
What do you think is the problem?