Audio sometimes doesn't work

When starting the game, the audio does sometimes not seem to work. For instance: when pressing a button on the menu, no sound will seem to play.

This is a very annoying bug that has to be fixed. People like EthosLab mentioned in one of his LP series that he had the same issue.

I have an external soundcard, wich might be causing the issue.

Restarting the game seems to fix it.