Audio randomly popping out

I recently aquired a 2012 MacBook Pro (Non-retina). I have my screen (Dell u2410) connected via a mini-displayport to displayport cable. I also run my audio via this cable en have my audio system connected to the displays audio out.

Whenever I play music or watch a movie I get random short cuts of audio. They are shorter than a second and happen at random intervals. I am not quite sure if it has something to do with the quality of the audio (more frequent with flac than 320 mp3) but it is quite annoying. I also want to note that this issue also occours in my bootcamp windows 7 environment.

What's interesting is that I don't have the problem when using the normal audio out jack.

Any help would be appreciated.