I purchased a Redcat Volcano STX. It works for 2 tanks of gas and then when you try and start it for the 3rd it wouln't start or when it starts the tires are running like someone is pushing the throttle button. I have replaced the clutch 3 times. The local hobby shop I take it to says it is the spring in the clutch. Does anyone have any suggestions as to what is wrong with the car? I spoke to Redcat and they told me to return the car to the hobby shop to get a refund. I call the hobby shop and they do not return my calls.