I had the same problems last days.....but very few times....2 fleetmates also had such an issue.....but in both cases it was as mystically gone like it came again after seconds when pressing all keys wasd or mapchange....i am also having an issue with the speedcontrol itself and keep flying where i want to stop sometimes but this issue is constantly being ignored by cryptic
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Turned out she had a controller/joystick plugged in that was lying in such a way that the stick was being pulled to the side.
I'm not sure if that would be the same cause here, but it's worth suggesting. Hope it's fixed either way.