sounds like a plug may have been cross threaded or the button in the head isn't seating properly. pull the 4 screws, check the headspace washers and the button for damage to the threads. I have 2 redcat 1/10 buggies myself. They are cheap, but they do the job for me. I got 4 kids, and can not afford to drop the $250+ upfront on a name brand buggy.