Pretty much what the title says. When I first start the game all sounds work just fine, but after 60-90 seconds footsteps, voices, combat audio and similar all stops working. However, ambient & music audio continues to work.
I see from previous posts that there were issues with sound not working at all, but couldn't find anything on people experiencing what I've described above.
I've tried installing OpenAL, but it makes no differences. My drivers are all up-to-date.
I'm playing on PC, via Steam under Windows 10. My sound card is a Creative X-Fi Titanium.