So my MacBook is a little over 2 years old, and it has been mostly problem free. However, it randomly restarts without warning nor explanation. I do not believe the computer overheating is the culprit because I am able to play World of Warcraft for hours without any problems. Sometimes the restart happens when I am working on Microsoft Word, sometimes it happens when I am listening to music. The log in console shows no troubles before the restart or even afterwards. What could be the culprit?