Suspension Noise problems of the 2007 Chrysler Aspen

A " snapping " or " popping " noise developed in the front suspension when going around a corner at ~ 30 mph. It was more pronounced when going over small to moderate bumps. Both the Chrysler dealer and an independent garage said it needed new upper and lower ball joints. I had them replaced and the noise is still there. No one can find the source of this noise. I am concerned there is a major defect and it will eventually cause or contribute to an accident. The 2009 Chrysler Aspen was recently put on a buyback list for suspension troubles. Both the 2007 and 2008 Aspens are the same as the 2009. I am curious as to why the 2008 and 2007 weren't included on this list.