UE4 4.17 BlackScreen in VR

Hello, I noticed some ugly problem…

We start our project in VR, it works great until I take off glasses (Oculus Rift). When I put them on again the black screen issue happens (there is no 100% reproduction, it happens only from time to time)

About black screen issue: in Oculus Rift you see only black screen, tracking is working, on screen you are able to see everything, when I press Oculus Menu Button, it shows Oculus Menu without problem, when I back from menu to game it have problem with communicating…

Have anyone any suggestion?