I have a 1/3.5 PNP Hawk from Skymaster. Powerbox Royal installed. I have about 10 successful flights. One two occasions the elevator went to full up deflection with no input command from radio. One time on the ground with engine running. The second time during takeoff power up. . Aircraft was recovered with no damage.
Servos are I believe the MKS style from Skymaster. I don’t recall if they are marked.
I have not updated software yet.
Any thoughts or suggestions to try to solve this? Issue is random and I am not able to recreate. It just happens at random times.