Spiral pendant hanging light (good bulbs not illuminating)
 

I have a situation where a Spirale pendant hanging light fixture does not fully illuminate.

All of the bulbs are good and which lights don't illuminate changes.

Any ideas on how I can resolve this?

Similar light fixture:

http://www.lightingdirect.com/imageb...800026-9-s.jpg

Take it down and check for the loose connection.
It will be under the plate that mounts to the ceiling.