Website shows I am logged in and then when I click on an article I follow, I am no longer "logged" in and cannot see the comments that have been following.
Wm Tidwell's article on the Divorce of MU & INTC has more comments that wind up in my notifications; but when I click on the notification or the article, I cannot see any comments, even though I have had access in the past for months.
It does sound like you're getting logged out somehow. Is this on an app or the website?