I had some whiteline links go bad causing a clunk in the joint. I replaced with eibach endlinks and shortly afterward the clunk came back and found the jamb nut has loosened.
We are in contact with the OP - The end link length adjuster lock nuts can come loose and cause this issue. The end link to sway bar and strut nuts needs to be 75-80 lbs ft of torque. Also, make sure the sway bar mount bushing brackets are torqued to factory specs.