The last 2 days I got compass errors when I first established a connection between the controller and aircraft. It goes away if I reboot the aircraft. This is a P3A with the latest firmware. I do the compass calibration before each flight and I do it here too and it seems successful but still gives an error. I am not near any major power lines or anything like that and this was in 2 different locations. The only things that I can think of are: 1) I am taking off from a picnic table because the grass is too wet. There is some metal to the structure of the picnic table. 2) I have my tablet case nearby and it has a magnet in it but it's small. Just to be safe, when I reboot, I move the aircraft a bit away from all of my gear. Any thoughts?