PM replies log me out.

So, when I try to reply to a PM, it won't send. It'll just sit there. Then if I try to go back to my inbox, the site tells me I need be logged in. So somehow, I'm getting randomly logged out when I try to answer PMs.

Hey JabBurrwalky. This is a weird one. What browser/OS are you on? Do you know about your browser's console, and if not, do you mind if I give you some steps to help figure out what's causing the problem?

It has happened in both Chrome and Internet Explorer. I do not know about the Console, no. Please do help.