Today I experienced a strange problem with my pixhawk. While I was flying, I noticed my multicopter was descending slowly, almost like it is autolanding. I was able to switch modes but to no avail. Eventually it landed awkwardly.
I do bring out my multicopter for a spin at sea sometimes. So I wouldn't want this to happen again.
So my question is, what are the conditions that it will act in such a way?