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I've used branded hubs before which have a limit on the number of concurrent active IPs they'll support, and once you get up to the limit, it begins to drop the connections at the top of the limit. Restarting usually sorts that, as your main connections get back on at the start of the chain. May be that your hub is OK but it just has a limit on the number of concurrent connections.
My Virgin Superhub is dropping the wifi every night for the last 3 nights. The CAT5 cable connection is fine though.
Reboot the router and it all works again. Borked unit?