Had the same bug running kernel 3.11 on Mint 15 (which is based on Raring). Everything was fine for a long time until suddenly one day while downloading a torrent!!! my filesystem locked to read-only and torrent stopped. Reboot solved it, but two days later, it happened again. Definitely not a hardware issue as Elementary on kernel 3.2 on another partition is running perfectly. No smartctl errors.
Had the same bug running kernel 3.11 on Mint 15 (which is based on Raring). Everything was fine for a long time until suddenly one day while downloading a torrent!!! my filesystem locked to read-only and torrent stopped. Reboot solved it, but two days later, it happened again. Definitely not a hardware issue as Elementary on kernel 3.2 on another partition is running perfectly. No smartctl errors.