I had the same problem on my 09. They replaced it and it happened again. I then took off the outer piece using some fishing line. You can then leave it silver or replace it with those reflective tape replacements they have on the internet. I added the tape in yellow and it looks like new. The other advantage is it reflects back light at night.
Here's a site
http://www.webxtremes.com/chevydecals.htm
Here's a site
http://www.webxtremes.com/chevydecals.htm