How we can reproduce it using the example you attached
1) Download the attached project
2) Deploy to Pixel phone using Daydream SDK
3) Swipe right to change scenes until you get to the ToggleVREnabled Scene
4) wait for VR mode to disable (it's on a timer)
5) Wait for VR mode to enable
6) wait for the enable/disable cycle to run a few times
7) At this point you should observe some instabilities such as dimmed screen or flickering when in VR mode
8) Observe crash or black screen then crash

Additional steps if it does not crash:
9) Change scenes after the instabilities appear
10) Observe crash