Unity3D 5.2.2: VRSettings.enabled = false occurs no rendering.

I am using unity3d 5.2.2f1

My VR device is Samsung Galaxy Note 4 (Gear VR)

In editor, all good(except stretching when VRSettings.enabled is false). but in device, there is problem.

If UnityEngine.VR.VRSettings.enabled = false in runtime, rendering is stopped (no frame changing)

After, if UnityEngine.VR.VRSettings.enabled = true in runtime, rendering is resumed.

Anyone know solution? please help me.

Thanks.