My first GTB was bad out of the box. It did the same thing as you say yours is doing. When I talked to Novak they said it sounded like the ESC. So I sent my brand new out of the box GTB back on my penny back to Novak. I recieved back a new unit.
Please become an organ donor.
Custom decals and Sno-Tee'z, T-Shirts by Sno Camel