same problem reported here:
See my reply there for an idea of the cause
Thank you reply.i set android setting in UE4 editor,but no use,this is my problem screenshots 
,my head can rotation,but the gear vr screen stop rendering,are you meet this problem for gear vr?expect you reply.think you.
PS :After many times i tired,i found out there is solution,if i turn off the wifi and mobie data on my S6,this problem gone!!!
PPS:The empty scene too!
please,i have spent almost 2 mounth on this game,even increase FPS from 25 to 60 all the time…please help~
Nuts - he got 60 fps and I get f*$king 58 fps in empty scene. If that was on PC, I’d blame hardware, but smartphones usually identical. I’d be surprised if my phone was at fault and not UE4 o.O
which versions of your Engine? Is that 4.11.1?
Currently 4.11.1
oh,it’s sad.i update 4.11.1,but i find fps<50:(
That can’t be the real solution though? I wonder what the cause is?? I’ve been seeing many reports of GearVR users on UE4 with a similar problem …
Ok,thanks for u reply.:o
Thought I’d drop in and say Sam’s twitch stream actually helped me a lot in setting up Gear VR as a new user. I took some of the answers with a grain of salt, but the process he showed got me up and running and that seemed to be the point of the video.