Hi all, I have a volcano with a 2speed box in and has been running great, however i have developed a bit of a problem, when i start it it runs great for around 5 mins then all of a sudden the power just dissapears, the truck goes really slowly and it wont change gear, if i pick it up and hit the gas the wheels will spin fast and it will change gear but when i put it down it just goes slow, if i stop the engine and then restart it she runs fine, i have tried to richen/lean out the hsn but it still happens, and suggestions would be greatly appreciated.