WRT55AG loses connection every 48 hours

Apologies if the post is too long...
I've had this router practically since it came out on the market. An IT person set the router up for me, but he and I are no longer in contact, and I've been having this problem for quite some time.
I have a laptop that uses either an Ethernet or a Wireless connection and a desktop that uses an Ethernet connection. All Ethernets go through a hub that connects to the router. The router connects to my Comcast cable modem (Scientific Atlanta.)
About every 48 hours or so, neither computer can connect to the internet. (So it's not a "wired" vs. "wireless" problem.) Releasing and renewing the IP addresses doesn't solve this problem; in fact, the only thing that has worked has been to unplug the router for 30 seconds or so, then reconnect. Then I have to reboot both computers.
I've gotten used to doing this, but my husband hates this and thinks there's "something that I've done" that's screwed up the settings. I just got done chatting with the Linksys live chat folks, and everything is configured just the way they say to. (I checked twice.) I've also tested every individual component (modem only; hub and modem; router and modem; all three together) and everything works.
I thought that perhaps Comcast was preventing us from leasing an IP address for more than 48 hours (and it's almost always exactly 48 hours), but my dad has the exact same setup (EXCEPT that he has a netgear router instead of linksys) and he's never once had this problem.
Any ideas on how I can avoid unplugging and rebooting every two days?

Hi !
U can will need to upgrade the firmware for the router ....n then reset n reconfigure it .........then it should be up n running !
Network Security Administrator (EC Council)
linksysfirmwares.googlepages.com/

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