I thought graphite was designed to break after a number of uses, I broke every one that I ever owned, usually in picking up a long line to recast or roll. The local shop said result of unknown/unnoticed impact likely, a couple of them were repaired, but I've gone back to fiberglass for most fishing. Did you ever break a 'glass rod in the same kind of fish battle? bamboo?
As I mentioned, I'm fishing older garage sale 9 and 10 wt. rods now and haven't broken them. I assumed it was only because they hadn't cost me a bunch of money.
One of the garage sale rods is an Ugly Stick 10 wt. It isn't much fun to fish, it has horrible action. It's probably a glass rod. The other is a Cabela's 9 wt. It's actually quite nice to fish. I caught a 25 pound ling cod on it last fall and it was a blast fighting him from 120 ft. down. That may be him in my avatar.
Both those rods are on the boat in Sitka. I'll have to check on the materials the next time I'm down there. Neither of those rods are as nice to fish as my more modern Sages, witch I assume are carbon fiber or graphite, whatever you want to call it. The nice thing about the Sages is, the lifetime warranty. They replace anything that breaks even if you aren't the original owner.