Phantom 3 Advanced rebooted IPhone 6 in flight yesterday and again today. I was not sure if I had inadvertently caused it yesterday ( next to impossible ), but today can document when it happened.

Auto take off, Raised another couple of feet, pushed button on screen to start movie (the new large format), Again started raising Phantom straight up, noticed the picture on screen not changing, black screen with white apple!

I brought it straight down, shut off and came home. The Iphone  was fine though not in the dji go app. Just like I had manually rebooted. I have never had any Iphone reboot itself before.

Same here, my iPhone 6 plus  restarted while I was flying on  POI yesterday. But I thought  it was because of my  iPhone is jailbreak-ed and might be one of tweaks . Is yours jailbreak-ed?

Stock IOS 8.4.1

Do you guys have at least 5gigs of memory free (assuming you guys took the time to close apps, etc etc)

I never use enough to worry. Right now in average use I have over 38gig free.