Typically I play singleplayer starmade while watching videos on a second monitor. Recently I've noticed that streaming videos and internet connectivity vanish while playing StarMade. I tested this by starting a video, then starting Starmade. The video ran to the point where it had buffered, then got stuck. It unstuck when I closed StarMade. Next, I tried an internet speed test. Without StarMade running I got ~5MBps connectivity. With StarMade running the test could not connect at all.
As best I can tell, running StarMade in singlplayer kills your internet connection.
As best I can tell, running StarMade in singlplayer kills your internet connection.