While burining the engines, all of a sudden my spacecraft will start violently spinning. This has only happened to me five times or so on this one sandbox. When it happens, Droo shakes a little bit and then I start spinning wildly. Each time, I was on normal speed with the engine at full throttle. I thought solar panels could be the issue, so I retracted them, but it continued to occur. Also, just wanted to say this game is fantastic, and I can't believe how many hours I've spent playing it over the past few days.
I'm not sure what caused this issue however, I am hopeful that by fixing a different bug that your bug will also be fixed. You do have the same error message in your log before it starts going haywire. After the next update comes out, let me know if you see this bug again. Thanks for playing! I'm glad to hear you are enjoying the game!