Unexpected restart
Hello everyone! My late 2011 Macbook Pro has had a bit of a tantrum and keeps restarting itself with the error message. This has happened a few times, though not too often and I just wanted to see if anyone can help me identify the problem? My mac generally runs just fine and this seems to happen every other week. I just want to check it's nothing serious and can easily be resolved.
Thanks!
MacBook Pro (13-inch Late 2011), OS X Mavericks (10.9.5)