Did you, ok, when did you notice then that the CA, or OA wasn't working? Everything was OK, but weren't you like "wait a sec, what's going on, why no beeps and CA bars across the screen?"
Because the other day I was bring my bird down because it was already windy but it picked up hard, I have the "thread the needle" when coming thru the backyard like that, and the trees are high, like 85' -100' tall suckers. As I entered the canopy the OA went beserk on me (oh yeah and had been giving me false positive readings when nothing present the whole flight, which was only maybe 6-7 minutes) anyway the OA is beeping and throwing crap out, and the bird froze, I mean it wouldn't pull back like I needed it to, I couldn't go forward either obviously, and either way would have been fine, it's the way the branches are in relation to the bird, so I couldn't even test side to side, too close. It's wouldn't yaw, it would however go up, but with it acting like it was I didn't want a bird that wasn't listening to commands even higher! Finally that's what I did tho to shut up the OA and regain control.
I found a large bug that I meticulously cleaned out the other day, had left a large part of himself in the crevice that I so carefully thought I cleaned all the way. Did a recalibrate and it's back working fine.
I find that by using one of the "C" buttons that shoots camera up and down real fast, that seems to really help when the horizon is off, if it's bad, it makes it a lot better, like 80% but doesn't make it perfect.