Audio and Visual delay

For some reason the video and audio are not in sync whatsoever, causing awkward cutscenes and in game confusion. Explosions and gunfire happening when nothing is going down or after the combat has already ceased. I’ve tried relogging in and closing the game but to no avail. Granted this does not always happen sometimes it works just fine. But the delay happens more often than not. Does anyone have any suggestions? I’ve checked all my cables already and they are all in good working condition and it only occurs in Star Craft II.