have also big problems with live video transmission on my ipad pro 9,7
on my ipad air there are no problems !?!
both on iOS 10.3.2 and DJI go 4.12
EDIT:
the problem exists only with the DJI go APP !
DJI GS pro, litchi, FPV and autopilot works fine
EDIT 2:
answer from DJI (?)