I just bought the Season Pass and got an extra AkSoundEngine.dll bug for free! I had over 500 hours of playtime without the DLCs and never encountered the bug before.
In a previous thread someone suggested the Flashpoint sound files might be the problem, which stands to reason after my experience. Is there a solution for this bug yet? I'm playing the Roguetech Mod as well, but am still happy to provide logs if wanted. I want to stress, that the issue appeard after buying the DLCs and not after installing Roguetech, which I played without the DLCs for a long time.