I need some advice. I bought this quadcopter last month and I have flown it about 5 times and it was flying ok and now it does not want to take off the ground. If you press start button all 4 propellers turn but once you throttle the joystick to up position, the 2 propellers stop and it capsizes. This happened to all propellers. I have bought new batteries for the transmitter and charge the battery for the copter but problem persist.