Time Capsule freezes network when the Internet is turned off...

MB Pro late 2008, 500GB TC, ATV
Living in a shared house, my TC is connected to the internet via Ethernet to a modem in another room. The wireless network works great and has no problems at all... until the modem in the other room gets turned off each night (out of my control).
45minutes to an hour later the entire network freezes... It also causes Finder on the MB Pro to freeze. This freeze can last up to 10 minutes, sometimes the only resolution being to force quit Finder. When everything starts working again, the previously full wireless signal shows as empty with an exclamation mark showing that there is no internet connectivity.
I've heard that switching network configurations can cause MBPs to freeze...
Has anyone else experienced this?
Or have a fix?
Cheers,
Bryn

You mention - "also, my PSP always detects the wireless network incorrectly. i gave the network WPA(TKIP) security, but the PSP detects it as WEP and therefore can't connect at all."
I don't own a PSP nor do I know anyone who does so I really don't know, but does the PSP support WPA?  If not then that would be your problem there.  It's looking for a WEP key and your router is broadcasting WPA.

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