I was flying yesterday and the P3A went to ATTI mode unexpectedly for about 5 - 10 seconds. Then it reestablished P mode. It happened twice the same way. I have flown this bird maybe 10 times and I bought it new. Prior to starting the flight I did compass calibration. I had full battery and full satellite positioning. I was about 2000 feet downrange. It happened at about the 10 second mark. The K-index was OK yesterday. Minimal wind (5 mph). What do I need to do to troubleshoot this?