THE OCULUS GO RESUME AND PASUE PROBLEM WITH UNITY

We are developing an application on oculus go with unity. In the application, we press the home button, then the application is in the background, we can click resume on the UI to resume the applications, but sometimes the 360 movie is not resume correctly. The movie will stop for a while then it resume, or it does not resume at all and stay the same image. 
The method we use is render the video player to a renderTexture, and renderTexture set to a material, and the material is used by skybox. 
We found two sample projects for oculus go called, InputFocus and Movie Player. 
The movie player sample has the same problem we have, and we also try to use the function that used in InputFocus, It does not work too. 
the link for the two project. 
https://developer.oculus.com/documentation/unity/latest/concepts/unity-sample-framework/

Therefore, can you give us some advice, why even the official example also has the same problem, and how to solve the problem?