Station shakes itself apart

[Vanamonde]

I'm assembling a station in orbit. New save. It's the only ship in the persistence file.

Here: http://www./download/w61bd86iz2r440v/Shake_to_destruction.sfs

Dxdiag: http://www./view/mrbbwcbyg8g6s7c/DxDiag.txt

Output right after part failure: http://www./view/42c1yfcf6t49sn1/output_log.txt

Once I detach the engine module that delivered that docking port assembly (circled in red),

the station picks up a tiny tremor. But it soon turns into a wild gyration. The whole station tries to spin on its long axis one way, then immediately reverses and tries to spin the other way, several times per second.

You can see how the forces are bending parts there. This happens with SAS on or off, and once it starts, nothing can stop it. I can't freeze motions by going into warp because the craft is "under acceleration." After a varying span of several minutes, parts fail and the station flies apart.

If I remove that docking ring assembly, the problem does not arise.

Mods installed: Claw's bug fixes, BD Armory, Hyperedit, Firespitter, FS Fuel Switch.

Incidentally, this also happened with a much smaller ship.

Edited August 18, 2015 by Vanamonde

[Vanamonde]

Update: these struts seem to stop the problem before it begins.

The station is now rock-steady and doesn't wiggle.