I can’t reproduce it by myself, but I have many reports that at some point, usually after longer gameplay, like hour or more, audio starts hitching (and never stops it, game need to be restarted). It seems this is happening only on some Windows configurations, often on older Intel systems. Anyway there are no Fmod warnings or error in logs. Game is not using any impulse reverbs, and only is using EQ and compressor effects.
I wonder if you had similar reports from other people or you remember changes from like few months ago, like threads or timer changes that can cause this, or maybe some specific Windows Update that maybe causing this?
I will try go get my hands on PC that this is happening and report more if I will be able to reproduce it by myself.