Weird, exact thing happened to me as well. I check the bolts every so often. Since I got a new pulley and belt I've been okay. I have an 05/2008 car.
Originally Posted by DanielGonz
My power steering pump bolts were becoming undone, as one was completely missing with the others backed off. This caused the pump to have movement and completely shredded my belt. Shit sucked, and it sounded horrible since it was a loud POP! Lost all power steering, battery sign lit up on my dash, etc.