Thanks for the advice. I tested it again, but they are not clipped, attached to any docking port, attached to any tweakscaled or procedural parts or anything. There are docking ports, but they are attached to other places. The sequence of parts is:
Parent: Cupola
Central part: Extra Large Rockomax Hub
(and then extending outwards)
1: Robodapter- 0.625 to Truss Pro
1: Joint Pivotron, half basic (fully deployed, unlocked)
2: RoboTruss Pro 2.5m
3: Hinge Pivotron, basic (fully deployed, unlocked)
4: RoboTruss Pro 5m
Attached radially to the 5m trusses are 4 Gigantor solar panels. They are originally placed perpendicularly and without using any clipping, but after loading, they start wobbling as well as the trusses (mostly, the first joint doesn't wobble, then the next one does). Due to the stresses and the random momentum, the station starts rotating and eventually all the solar panels and the outer trusses either explode or break away.
Please help! Sidfrid is getting mad and disillusioned.