I had one do this once and took it back to the store for a replacement (I buy mine at the local Fry's). Easy.
The only other hardware issue I have had is that apparently, there is a glitch that causes the SSD to go bad on some write cycle or other. Once this happens, you basically are toast for that SSD and you have to start over with a new one.
That was supposed to have been fixed, but I still get that one about once a year, though not yet on my B+ Pis.
I have increasingly put the critical data on some sort of USB-based storage to combat this.
Except for that, I have had no hardware issues.