I've got a very small probe rocket that I'm looking to launch to harvest a bunch of "Return science from X location" contracts- in this case, Kerbin orbit.
However, when I try to launch the probe, the rocket becomes uncontrollable in a strange way. First, the engine begins to shut down- the throttle is decreasing as if I were holding shift, though I'm not. Secondly, after the engine has shut down, the craft suddenly spins completely out of control, even though it was easily in control before. This starts to occur at alt 3km, speed about 330m/s. I've tried various combinations of the wings- it's a cheap vessel so I originally went with 8 basic fins, and I also tried 4 control surfaces, but it didn't make a lot of difference. Finally, the engine also randomly re-ignites after the craft starts spinning, which as you can imagine puts a terminal dampener on my aspirations to orbit this craft.