I was recently flying on the beach. P4P DJI 4.1.18, AC 1.04.0602, Remote 1.04.01.00....and got these warnings. I’m most concerned about the IMU & Compass, also the fact that I lost Satellite signal for about 6 seconds. I took off from my backpack sitting on the beach. On a previous flight a week before, I was getting a compass error, so I moved the P4 to a different spot, off of the concrete to take off. So after the compass error on this flight, I landed and calibrated the compass, that seemed to work. Any thoughts on what may have caused this?