I was at 1000+ meters, when engaged RTL. My RTL altitude is set to 100 meters. So I expected plane to glide towards me till it reaches 100m and then continue with motor if still didn't reach me.
I had strange issue yesterday. While in ALT_HOLD mode, quadcopter suddenly starded climbing like a rocket. Did not respond to my throttle input until I switched to STABILIZE. Then it got controllable again.