Did anyone has problem like mine : Before start I had calibrate compass which was already weird as I never did it before, but ok. App. on my phone informed about that. After few minutes of flying when baterry reached 60% alarm started and at about 55% start quad to descending. I've been scared because flying was above water. Luckily it all finished well but question remains. Anyone experienced such abnormal alarm ? From the very beginning I had set 30% and alarm goes on. Mark.