Sounds like a loose trussrod to me, normally it shouldn't bend unless you use execive force taking the body end with one hand and the headstock with the other.

I've had this once to and found out after my guitar fell that the trussrod jumped loose, probably it had been hanging at some place in the neck and fellt tightend for that reason but it might have been the thread on the rod which got hung onto some would sticking up.