I had 2 big issues lastly with my Powerbox Royal installed on my demo Diamond.
The plane has been flown for a year and a half so far with settings that lets me fly perfectly on a wide range of speeds.
However, last week, when doing a hig speed pass, it starts oscillating very dangerously and I was forced to deacivate the gyro for the rest of the flight.
Before take off, I got two strange behaviours: The flaps start glitching together without any evident reason, than after cycling power on and off, all the servos where unresponsive.
Both receivers (Futaba 7003) were powered on, theyr leds were green, and on the PB display, the two white dots were there. Everything indicates that the link between radio and receivers were ok. We even tested a servo connected directly to the receiver, and it worked fine.
Once again I cycled power on and off, and everything came back to the normal situation.
FYI, this plane flies on behalf of Aviation Design