I've had my P4 a week and put about 2 hours of flight time on it. No crashes, no hard landings. I've noticed a tilt in my videos. I've traced it back to being there on my first flight video. I've done calibration a few times with no change. This is what it does at startup: At 18 seconds it settles to one side. It acts normal with smooth motion, but it doesn't seem to know what level is. Makes the horizon in all my videos tilted. Also, is that clicking noise normal in startup?