Hi i was with my nephew out flying today with his TT60 trainer. All was going well untill 8 minutes into the flight he lost Rudder,Aileron and Elevator. The throttle did still respond but nothing else worked. The airplane spirald around in a circular flight for about am minute and a half making 6 complete circles each time getting closer to the ground. Still no control but throttle. After the impact on the pavement we took the airplane (what was left of it) back to the truck and checked everything out. The Ailerons, Elevator and Rudder were now working and the battery had 5.20 volts left. The Radio had 10.3 volts and everything seemed to respond ok. The airplane range checked out Ok . The airplane was much farther away from us before the problem and was operating ok. Any help or advice on this problem would be appreciated. Thanks