I Finally Solved The Problem With Sign Out

I finally solved the problem that caused my computer to spontaneously sign out of Yahoo. I found out that it was the AVG toolbar. I disabled all my add ons and then went through by process of elimination until I found the one causing the problem. I downloaded session manager too, so I can log off and come back the next day and continue reading stories from open tabs without starting over. I'm so happy I figured it out!