I tried switching the GPS off mid-flight and didn't have any issues other than the drone wouldn't hold a steady hover anymore. It would kind of drift with the wind with no stick inputs. I assume this is normal. However, I got a scare when I switched GPS back on in mid-flight. The drone suddenly lurched sideways about 4'. (it was a really fast motion) I immediately counteracted the movement with the corresponding stick control and the drone settled down. Is this normal?