It seems like every time I click on any link in the recent activity section of a forum it logs me out, and when I click to log back in it takes me to my profile instead. At that point you have to go back and find the thread all over again. Not hard to do but annoying that it happens every time for me. Can this be looked in to and seen if it is a problem for others or just maybe me and my copy of IE not liking the layout of the site for some reason.
I run into this as well, check the url after you click the link. If it changed to community.activision.com then it wants you to log into activision.com (different log in from callofduty.com). Quick work around is to change activision to callofduty and refresh the page.