Stations shaking themselves to death is a well known “feature” in KSP, and it has nothing to do with autostruts. They may even help in some cases. It’s just that when a station (or any craft, really) becomes large and/or branched enough, with heavy parts (i.e. fuel tanks) on the ends connected to light parts in the middle (i.e. 6-way node), especially through multiple docking ports, sometimes a positive feedback loop forms, and parts of the station start shaking with increasing amplitude until something breaks off.
There’s no way to know exactly when it will happen, sometimes it will happen when you just load a scene with the station.
@PiGiCooL What can help: if it started shaking, there’s little you can do. Hitting timewarp will stop the shaking temporarily. What you want to do is rearranging the station parts. Undock some and redock them to other ports. It helped me a couple of times. As I said, autostruts may help, but there’s total randomness as to what modes on what parts you have to set them to. Play around with them, and when the shaking gets violent, hit timewarp on and off, and it will revert to shaking slowly giving you more time.
If you have an earlier save before you docked something to the station, go back to it, and dock to some other port. If there’s no other port, I’m afraid there’s nothing you can do.
Hopefully it helps.
P.S. When building large stations, try to have heavy stuff in the middle and not too many branches and crossings.