I always use the "what was the last thing that was done" theory when troubleshooting. So the most probable point that could cause this, and that was touched, would be the forward end of the LCA. Might check the torque on those bolts.
These bolts being inserted from the bottom up are IMO poor design. I brought it up in a different post. The bolts should be inserted top down. That way if the nut falls off or bolt loosens, it can't fall out, as yours did.