I have a new Exceed G2 from xheli. Worked great out of the box, no crashs and no hard landings. I spooled up the other day after about 5 test flights, and the main (top) gear spins in synch with the motor gear, but doesn't spin the main blade shaft. The gears are not stripped, which I thought was the orig problem, but no. When spinning the gears manually w/ my thumb, the bottom gear spins the main shaft, but when I turn the top gear, it doesn't turn the main blades. Any ideas??? Thank you.