So the UK weather finally cleared up, lovely sunny dry with low wind. I had been planning a trip to a nearby castle for a week but the weather prevented me. I got there this morning fully charged (in every way possible) and launched from a nearby park. After a little skipping over the castle grounds, I was throttling forward when I realised she wasn't doing the same. This was 11 minutes into the flight. Almost seemed to just hover. Then I get a forward propulsion warning claiming to be limiting my propulsion to conserve battery. I still had well above 50% remaining at this point. I have had her flying in the past as low as 15% and never seen this warning before. Worrying that my throttle stick was virtually disabled I hit RTH and she headed back, albeit slowly. I am a bit concerned now. What would have caused this?