I switched my tank on yesterday, the lights started blinking as normal, but when I pressed the ignition button on the controller, nothing happened. I tried it again a bit later and after pressing the ignition button a few times, it did eventually start up, but wouldn't move, and then wouldn't switch off. I had to switch the tank off using the on/off switch underneath. I have had it apart tonight but can't see any loose wires, and all batteries are charged. Has anyone else had a similar problem?[]