On my 4th flight on my new rig (1st three went well) the Z axis (up/down) was really wanky. Upon start I would manually rise to about 30' and hover for a minute to think about my route. Then I would ascend and it would rise very quickly, but when I moved the stick to descend it would barely move and then slowly start to lower. I went up to around 100' and flew around very close to home, and it again was difficult descending. In fact it began to rise to quite a height on it's own, but the altimeter still showed it was at 35"! Getting nervous now, I tried to get it to descend manually and by pressing auto land. Very slow descent and then it accelerated to a rapid descent. I saw it racing to the ground (with all sticks neutral) and then kept hammering the left stick to stop it which didn't work in time and it crashed into the grass with only one prop broken. Put a new one io and tried again, Same thing, but I was able to stop it before crashing. It appeared that the descend commands were sort of very delayed and then became effective after the stick was neutral?? Having it move up and down on its own was outright frightening. I tried RTH on both attempts and it did not respond vertically. When I finally got it lower it did respond to the auto-land command. Only difference since last flight day was an adjustment to the joystick EXP settings to get them to be more sensitive. All the other stick movements worked fine. After the crash I reset them manually to the original values and also pressed the Reset All command as well as shutting down and re-starting. Made no difference. I also made sure It was in basic GPS mode with no special modes engaged. Is there a reset all settings for the entire controller?
