Yeah, I had a pair of MDR-V700 back in the day, and they broke in about 2-3 years max, without any abuse, just randomly.
I gave them to a friend who "quick-fixed" them with a screw at the pivot point, but they lost all their flexibility after that. He didn't mind because he was using them solely for drumming, but I couldn't use them anymore.
That being said, I have had some nasty experiences with Sennheiser's IEMs as well. Had to send 2 of them in warranty within a year, products that were in the 300-600 euro range back around 2010!