I never had any issues like this before, but after installing the new Windows update (1607) I have following issue:
After some unspecified time, the Unreal Engine will lose connection to the HTC headset.
Steam VR shows the game (UE) unresponsive and nothing is rendered on the HTC’s display, not even the Steam VR environment.
The game is only shown on monitor with low FPS aroudn 1-5.
Only way to get it working again is to restart UE and Steam VR.
Happens always within 20-30 minutes of repeated use of the UE.
I had already verified the engine and re-installed VGA (nvidia) drivers.
Could you provide the project so that I can take a closer look? This can be done but providing a link to a zipped down version of the project via drop box or google drive. If you would like to provide it privately, you can do so by providing it in a private message to me on the forums.
We have not heard back from you in a few days, so we are marking this post as Resolved for tracking purposes. If you are still experiencing the issue you reported, please respond to this message with additional information and we will follow up.