The XM3’s did break on me after a couple years also. But I liked the quality and feel a lot and I got the XM4’s promising myself that I’ll take better care of them this time
Discussion
I wish your headphones a long life. I will never buy headphones from Sony because they wouldn't cover the failure under the warranty, despite them breaking inside of the case, and showing them a photo that clearly demonstrated that the part was defective (it had air-pockets where the breakage occurred, shoddy injection modling)