Audio sync changes after a while

[franc]

Hello

I have some videos where I notice a very annoying problem: after a while, especially if I pause and rewind often, the audio is not anymore synced but delays.
I stop then the movie and restart VLC player again, then it is adjusted again.
I don't know where this is coming from.
I have VLC 2.1.5 on my MacBook with OS 10.10.1 and the sound is going through Bluetooth to an amplifier.

What could it be?

Thank

frank

[franc]

Strange. It didnt happen anymore, maybe related to the video then.
Never mind.