Coilover struts seizing/binding?

I've been running my Insurance coilovers for about 2-3 months now with absolutely no complaints until recently I've noticed that it seems the right front strut seems to be binding/seizing and making a harsh popping(best way I can describe it) when I go over some bumps. I can feel the popping and it is audible outside as well as inside the car when driven and when someone creates an up and down motion on the vehicle at a stand still. Visually I believe what I see and hear look to be related to the shock strut seizing/binding but I don't know if it's really possible to have this happen but I'm a bit concerned as to what I should expect in this situation.

If this is really the case, hopefully there's something I can do and Insurance will be helpful in a solution to the problem. I will be dissasembling my right front to look for any other causes but for now, I'm about 80% sure that's what it may be. 

My problems never end :|

spring is my guess. its happened to me before
add a small amount of preload on the springs, should take care of it. 
 
IF NOT
it could be:
Pillowball mount (small chance) 
or a blown shock that is in fact binding as you suggest.
 
I woudl take off hte wheel, and inspect the coilover for leaks and scarring, and gouging before comming to any conclusion.

Check the top mount, the pillow ball might be loose and has play. I dont think the shock would bind cause id would probably just blow the seals and start leaking fluid.