I know what your talking about Spudmonkey,
Last night was in a mission and had just moved to my 4th hover position to clean up the last of the soft and arty targets and I couldn't get the craft to hover, had altitude, auto turn off, the 4 auto pilot helps on and they were lit, auto pilot track off "r", Held trim to hover with the worm too zero. release trim, engage auto hover and it just starts to rock slowly forward and back and slip to the left. I'd been in the mission for about one hour so don't think its electrical. Ended up going in with guns in the end. Its not the first time its happened. Can the trim memory be reset because it was like I was fighting the trim ?
Cheers, Gav