360 Video player not Synced with Audio

Situation: We are developing some 360 Video educational modules in the Gear VR. Problem: The video lags about a second behind the audio. Unity Version: Unity 2017.2.0f3 (also tried Unity 2017.3.0b8) Device: Samsung Galaxy S8

(The issue does not occur when using AVPRO Video player). The issue only exists in the phone, not in the editor.

When a scene loads, the script sends a play command to the Unity video player, but the Audio starts playing a beat or two ahead of the video playing. We've tried having it auto-start, or not. We've tried having it wait for first frame, or not, and it didn't seem to help. We also tested a video that was not produced by us, and it had the same issue. Has anyone had similar issues? Suggestions on how to overcome this?