Kerbal Space Program

I observed that ships in orbit without SAS capable devices or any kerbal, instead of stay like it was (while in focus), start to spin more and more in every axys, not preserving its momentum and inertia. This is wrong, since there is no force applied to the ship, it should stay as it was.
This turns frustrating try to dock with an unkerbaled ship.

There is a turnaround for this: shut off any electric supply in that ship, it should prevent whirling it when you change focus.