I've been noticing sporadically that the Previous Thread/Next Thread function at the bottom of the page doesn't work. It sometimes directs me to a thread i the forum that isn't the previous/next one. This is not a matter of sticky threads or of new posts at the time. I notice what he next thread should be, before going to a thread, click on next thread, am surprised by the result, and then return to the (refreshed) forum page to check that I was still right about where I should have been taken.

I've noticed this in several fora and it's been happening for at least several weeks, although initially I thought that I might be imagining the problem.