Sounds like your battery is failing or is too low to operate correctly. If your battery is starting to fail the voltage drop from commands can drop down below the safe level and the tank shuts down to prevent further battery damage. Try charging your tank up on the stock charger for 4-6 hours and see what it does then. Measure the voltage, you should ready 8.5V+ volts or so. This indicates a full battery. What happens is there is minimal power needed to start the tank and once you perform an action the voltage drop due to the command from the motors/sound/firing unit cause it to get too low and it shuts down to prevent battery voltage getting even lower. Continuing to start the tank can cause more damage to the battery if this is the issue. Give us a message on our site and be as detailed as you can and we will be happy to help