Topic: Seems like I sometimes get signed out really quick, more often on mobile.

I'd imagine there's some kind of auto sign-out feature going on, but especially on mobile I'll be regularly reading an article, and by the time I finish reading even one article and writing up a comment, I get the "Sorry, you're not allowed to post comments." message because I've been signed out.
(a little worse on mobile since I can't copy-paste)

@KingMike have you tried using the “remember me” option? Or are you still having the issue with that enabled?