While not the first time I have experienced it in 0.86, I can confirm the sound bug. I heard an invisible hummer just west of the western mosque today in the same round with Outlawz. I am sure the devs are aware of it and continually working on it. At least, I like to think so...
anyone ever figure out how the sound bugs start ? i know the squad bugs start by noobs joining quitting rejoining squads quickly or by creating leaving creating etc....