You didn't note what method you used. CDRW media is rated for about 1000 or a bit more erase cycles.
Light discussion at http://hardware.mcse.ms/message38134-3.html
As such, these are great for once a day usage and you'll get about 3 years of use. Some try to use it like a disk drive and they will suffer.
Hey, I just hooked up a CD burner in my computer, and I've been burning some CD-RW's... Well I can only rewrite the things a few times before they stop working completely! I've been using Imation CD-RW's since I got my burner, and I guess my problem is cheap media. I'm wondering if anyone would care to point me toward brands that have been reliable for heavy rewriting...you know, just so I don't have to buy a spindle from every company and compare...thanks!