[BUG]DirectX 11 cloth physics broken after a while

It's very hard to notice, and it's been happening to me every time.

Basically, I'm running the game on Dx11, and have the physics on, and when I start the game, when I move, my rope is having the awesome new cloth physics.

However after playing for a while (about 2 hours ish), the cloth physics is gone, and my rope goes back to the dx9 movement (the hand-made one I believe?), which is not as awesome.

I can fix it by re-logging in my character. But it gets broken again after some time.

The cloth (glamour) is Valerian Shamen's Chasuble.

This has been a problem since before dx11 and it seems to affect everything except hair physics for me. :T