when i fly fpv i always fly first in stabilize to about 30 metres and then enable alt hold. Works fine and makes flying fpv easy. However sometimes the height of the quad drifts to say 10 metres high and i have to switch back to stabilize and increase height again to 30 metres. This only happens occasionally. I fly only in the evening when there is no wind. Why does this happen and what is the solution.By the way i have never seen this happen in auto missions.

Thanks

Damo