I'd never had this problem before, but hadn't flown my MP since last Sept. Got it out two weeks ago, updated all firmware/apps and flew it (Connected with iPhone 6s) and had this 'Disconnected' message pop up after about 90 secs around 200m away. As with other posters, still had remote control and RTH brought it back safely to where I could land manually (although 'Disconnected' message was still showing on the iPhone screen). I changed batteries, rebooted and tried again - exactly the same thing happened. Temp was below freezing at the time so I put everything away having decided winter flying in the mountains maybe not a good idea, but this post has me thinking it has nothing to do with that. Won't be back where the drone lives until May but will be interested to see whether the same thing happens then - big problem if it does ! Hoping DJI puts out an update in the meantime.