[WalterM6]

Here is something you might think about. There has been a lot of problems discussed here about lifting your cart and the brake cables become too short. It shows up when your rear axle twists during high torque or accel. The twisting yanks on the brake cable and applies and releases the brakes. Anyway this sounds like it may be your problem. The solution is easy get a passenger side cable for the drivers side if this is your problem.