Hey, I looked around and couldn't find any with the exact problem. Whenever I flying an aircraft (not heading to space), and I throttle engines to the point where mach effects begin, the sound starts stuttering and eventually results in a crash. It seems to only happen at near-sonic and super-sonic speeds. Regardless of the aircraft. I haven't tried to fly in the upper atmosphere. I am still in the early career mode stages of the game. All rockets seem to not be affected; not sure if launching from the other launch makes a difference (i.e. I have not tried to launch an airplane from the rocket pad. I have seen some people suggest, to similar problems, that using the force-opengl fixes some of these issues. I have yet to try that option, but plan to soon. I will post any updates. Thanks, any help would appreciated.