Could you upload the log file from your NVidia machine? (See this article on where to find it: https://brightrockgames.userecho.com/topics/118-how-to-submit-a-bug-ticket/)

There are quite a few abnormal errors in the log, however none pertaining to audio. Unfortunately that means I cannot provide much further assistance - The 3D engine we're using is Unity3D and whilst its Linux support is okay, it also isn't the best.

The only advice I can offer at this point is to try a few different audio driver versions and having a google on any users who have had similar issues with the Unity3D engine.

Sorry. :/

Can you provide an up to date Player.log for review?

Could you please submit the log files of those play throughs as per instructions here? https://brightrockgames.userecho.com/topics/118-how-to-submit-a-bug-ticket/

Thanks. We've forwarded the bug report to Unity 3D for review.

Hey mate. This can occur sometimes due to bad GPU drivers. You may need to look into updating your GPU drivers or switching driver type.

That's certainly an odd one. Can you explain further the situation? IE what map, how far in, etc

Has this only occurred to you once so far? Were you able to reproduce this problem?