Please help... Its come back every time I use it... iPhone 6 Plus, latest 10.3.3 DJI Mavic and RC 1.03.0900 and App 4.1.5 . I cant disable hardware acceleration also? Why the option is not there?

The app will test the usage of the mobile device's CPU, when CPU is overloaded, decoding of transmission and flight communication system may be affected and the device will get heat. We suggest that users use a monitor hood or avoid the direct sunlight to the mobile screen. There is no hardware acceleration option on the app.

the latest iOS11 Beta, has seemed to help resolve this. Or switch to Litchi

The Latest iOS 11 Beta has seem to resolve this or you can switch to L i t c h i