Bit concerned had first app crash today in 70+ flights. Was half km away videoing and using FPV when iPad Air 2 went blank. After 10 seconds of panic the app came back and I high tailed it home. Replay of video shows no break other than me doing circles trying to find out which way my girl was facing. Only odd thing was just before take off the iPad changed to a compass calibration screen which I cancelled and it returned to the pilot app. I do not have the apple compass app loaded on the iPad. ??? Maybe a coincidence. Any advice would be appreciated - have gone from a confident /cautious 64 year old pilot to heart attack material!!!!!!!