umm, there's not a lot to do about this, it happnes if someone partly enters something in the quick reply box and doesn't post it and also if they move from the page they're looking at if it's not fully loaded yet. What it actually means is that there might be infomration unsaved or unviewed do you want to navigate away. The software designers area aware that this is an issue for some people and they're looking at it.
I get it now and then but not very often. Try to let the full page load before moving on and don't click in the quick reply box at all unless you're going to post.