How long does it last? It should happen no more frequently than 20minutes and should only last for a minute or two. So if you can't access PA, wait 5 minutes, hit shift+refresh. If it only comes back up after you reboot your router, you have some wierd caching happening somewhere on your side.
The newest update of Firefox. Version 1.5.something
Basically, It flushes your cache and attempts to redownload everything as if it had never been to the site before. What is useful is that it resets any error states (atleast those that we have to worry about if the rest of your internet works).
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