I have the same issue. Every time I start my bird this same pod does this initially but after a second it will start and fly normally. I've had this issue about 5 or 6 times where it will not fully start at all. After a couple of days I'll go out and try it again and it will start like it always does...twitch and then start. I'm worried about losing a motor in flight but it has never acted up once it starts spinning normally. I've even had it "twitch only" after flying and then switching batteries.