random flaps?

I seem to have an issue with the flight1 mustang. At random moments the flaps will either increase to takeoff or landing flaps without moving the lever. This happens during climb and at cruise. I was at FL350 at 200 knots. I stepped sway to make some dinner and when I returned the flaps were down and airspeed was 98 knots. That all happened in a 15 min window. The plane starts to bank left then right and starts a 10 degree dive and then a 10 degree climb. Very strange. Anybody else have this issue?