Menu links going "dead" and New Posts

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When I'm in a thread and have posted or remained in it for a period time reading through, the menu links like "New Posts" or "Forum" at the top are dead and I have to reload the page to get them to go live.

Also, is there a reason that New Posts doesn't always reflect all the new posts that have been made? For instance when I post something and then click on New Posts after submitting my reply the thread I have just posted in doesn't come up in the list nor does it show up after a few minutes.

Do either of these behaviors happen to anyone else?

P.S. I'm currently using Firefox as my browser.