Unfortunately, a somewhat common problem. They need to be periodically treated with a good plastic protectant to make them last. Putting your car through a "touch-type" car wash can cause the wear much sooner. They cost about $100 each side at Volvo. Some people have had good luck by striping off the pealing plastic and painting the trim. An Indy near me does it frequently and says they last much better than the originals. They do the job for about $50 each side.