Media Stream looses source

I have a media stream in my oculus GO project.
Sometimes the video freezes and it seems that ue4 looses the reference to the stream as I can’t even seek the video anymore.
Has anybody stumbled across such problem?
Or can it be that the server is responsible for that?
When I start the app again then it is solved sometimes, sometimes not.

Greetings,
Evil_Fischi