iPhone 5 Bluetooth audio syncing issue

Hi,

I have I iPhone 5 paired with my 2011 Acura MDX NAVI. Audio is clear however, when my kid watches movies or clips from YouTube the audio and video does not sync up. Audio seems to be delay for 1/2-1 second which is quite annoying. The iPhone 4S didn't seem to have this issue. Does anyone encounter this issue or have a fix to this problem?