I have a mid 2009 13 inch Macbook Pro. For a while now, randomly it will log out and I will have to log back in. It doesn't happen a lot though when it does it seems to keep happening. The one evening it did it over 20 in a three hour period. I have went to the Genius Bar twice, the first time the Genius admitted that I had stumped him! I have also talked to an Apple Specialist for over two and half hours on the evening that it kept doing it. The only remedy that I have been told is to reinstall OS X which has been done now three times. Once before I went to the apple store, the second time after and the third time Apple did for me. The two times that I have I did a clean install and then just dragged back the home folder minus the home library. Now that I have updated to Lion, it has happened twice, so I don't know what to do. The hardware has been inspected both by Apple and by my University's IT department; both found nothing wrong. The only upgrade that I have done is I bumped the amount of RAM from 2 Gb to 4, I got the RAM from Crucial shortly after I got it. So guys any idea? Your help is greatly appreciated.