This happens not every time, but I already faced that behavior three times in 10 recent missions.
I take off in Stabilize, climb at 1-2 meters and then switch to AltHold.
Copter falling down almost to the ground. And after half second it starts climbing again.
Here my throttle radio channel stays the same when I've switched to AltHold.
But desired climb rate drops to -130 for some reason.
CTUN.ThI is some strange saw too.
Finally after about a second all become stabilized.
What could be the reason?
2017-08-11 23-52-44.bin (944 KB)