Ed Merkler

My car is a 2003 e500. I recently replaced the rear sagging air springs with the Arnotts. I also have Arnotts on the front. Since replacing the rear air springs the front suspension now sags, which has never happened. What is confusing is that the sagging does not follow a particular pattern...sometimes overnight and other times all is fine for 2-3 days before it sags again. I have checked the air connections in the rear and they are tight. Any troubleshooting ideas?