The Dink Network

Indeed, it's an issue with sounds set to loop/survive where the d-mod author hasn't bothered to kill off the existing looping sound meaning that the old ones play forever which eventually eats up all available audio channels. I'm guessing the script for it was nabbed from Cycles of Evil which does the same thing if you traverse too many screens early on. The audio system is supposed to intelligently cull old sounds when it hits that limit and then play all the more recent ones as channels becomes available. I haven't fixed it yet, but it's the same across all operating systems.

I don't know what's causing SimonK's issue however. All I can think of would be to see if converting it to Ogg Vorbis changes anything.