Hey, cool to see someone go really hard in on it. I'm also loving it, but haven't had the time to go as deep as you have.
I just wanted to comment here, and say I too experienced the audio glitch you described.
- I spun the ship around fast in the System Map. I left quickly and the spinning sound kept playing until I landed on a planet.
I ended the sound the same way, but I also think you can end it by going into the ship controls again and resuming control of the ship.