I've been getting this bug too recently. I'm using an external USB DAC to drive my headphones which seems to be common for those with this problem. I'm playing on Windows 10 with a Ryzen 2600, an R9290X and 16GB of RAM. I suspect the issue involves some kind of CPU bottlenecking as sometimes when the bug occurs my game will slow down and even freeze before catching up and playing ll the audio I have missed. The bug was not present with the same DAC/headphone combo on an older system of mine with a Xeon CPU and 8GB of RAM and the same GPU