If a new or changed material is the cause of this, the question should be why was the change made. Being cynical I have to say cost.
I owned a Citroen car (the ones with hydraulic suspension). After 6 weeks from new the High pressure pump failed. Reason? They had changed the type of bushes to cut costs. They eventually reverted to the old type bush, but the whole episode must have cost more than using the 'cheaper/inferior' bush in the first place.