[wvenable]

It doesn't just happen when writing comments; it can happen almost anywhere on the site if you linger too long. It's the most glaring fault with the software behind this site and would be completely impracticable if this site weren't populated by technology-minded people who aren't bothered by error messages.

[FaceKicker]

Agreed. I've pretty much gotten used to refreshing before I click to the next page every time...

[ericd]

I just open up each page I'm interested in reading in its own tab, I've never really had a problem with the error message unless I take too long on a comment.