I used to have a heck of a time before I got my new computer. With the old one I would log on only to be unlogged or so it looked. I would click on the header and low and behold I'd be back to logged in. Same would go with pm's

Turns out it was the old laptop I was using, old as in 7 years. Since getting the new 'puter, I have had none of those problems.