Yes, this is a known issue.
Be careful to check before you write a reply as you might loose the reply on clicking on the post button (this is a test as I am actually not logged in while writing this, so "select all" -> copy -> post)
edit: this time it remembered my text, so it looks like that there is some improvement already.
On a call just now Khoros agree to set the time-out to something longer. They were going to try to go do it right now, for the moment, I requested 8 hours. I think that seems like a reasonable time, they tend to like to log people out in order to keep webserver open sessions to a reasonable number.
I'm curious what other sites do, I remember in 2006, I think it was days. But not sure.
Exactly - they can close the session, but keep the authentication token. Thanks for pushing on this - as wila mentioned, it's really annoying that you can start to reply when not logged in, and then lose the text you've written when it prompts you to authenticate.