I never did manage to get much further with it - and the error could occur whenever. I had it happen even in Cordon, but the stancia maps seem to be the most common place for it to occur.
Aside from drastically cutting back on the ambient sounds involved - I think the biggest issue, with using the DW script, is that all ambient sounds are essentially cached and pre-loaded at startup. Perhaps, if nandersen isn't around anymore, someone else could look at the script, and see if there's anyway to forcibly "unload" cached items that are not currently in use? That's just conjecture, though, not even sure if that's possible.