Intermittent app restart when user resumes from global menu

Hi

We recently added code to our GearVR/Go version to handle VRC.Input.3  - calling OVRManager.PlatformUIConfirmQuit() to bring up the global menu when pressing the back button.
However, around 1 time in 4, the game restarts when choosing 'Resume'

This sounds like the bug mentioned in the Oculus Utilities release notes: 

• Do not use Utilities 1.11.0 due to a crash when returning to focus from Universal Menu or Quit to Home dialog.

We're on Unity 2017.4.9, using the bundled Oculus Utilities (appears to be 1.26.1)

Are we running into that bug, or is the game being restarted for other reasons, e.g. an out of memory condition?

thanks