For those experiencing frequent DJI Go crashes (for once on iOS and not Android), it should be fixed by updating to the latest release of iOS (11.2).
I haven’t tested this personally yet, but experienced very frequent crashes yesterday whilst flying on 11.1.2. However, according to DJI, this is because of an iOS bug now fixed in 11.2. I hope so as you frequently lose control of the camera, or Go crashes completely and will only run for a few seconds or minutes before crashing again and you lose your flight logs.