Media Player Limited to 4 videos on GearVR / Galaxy S6???

Hello guys,
I’m experiencing a weird problem: I am playing a 360 video on a sphere by using a Media Texture and the Media Framework. Target platform is the Gear VR (Galaxy S6/Marshmallow version).
Currently I can play several videos on my sphere (selecting them from a sort of menu) but, after the fourth, I cannot see them anymore!
I can still watch one of the previous selected videos, but not the fifth. The problem appears regardlessly from the videos selection order, so it shouldn’t be a video issue.

Looks like some variables/caches/buffers are not cleared correctly, is there a way to re-init the media player or any related stuff?
Does anyone experienced this behaviour?

Thank you!