"Torn" static mesh on Android (Gear VR) - why?

I deployed my test scene to Android (Gear VR) and when tested on the device, my static mesh has missing polygons. Looks like has holes in random places. In the Editor on PC everything looks fine. On the device (in Gear VR) - missing polygons.

Any idea if there is a tris limit on a continuous static mesh (for GLES 2.0 for Android perhaps) ? Thanks.