Is anyone else experiencing reboots? I can be working along like normal, and all of a sudden, the mouse freezes and the computer just reboots. This started happening after I installed El Cap. a few weeks ago. I have not noticed it happening while using any specific program. It has happened while using Safari, Mail, Word, Excel, iBank... This weekend I believe it happen 4 times on Sunday. The computer was on all day, so it happened every few hours. There was one time it even happened while not at the computer. I was in the other room, and I just heard the reboot chimes. Luckily, not much of the work was lost each time, but it is quite annoying and concerning. I have an early 2008 15" Macbook pro. Any thoughts on the cause or suggestions as to stop if from happening would be appreciated.