Sonic.net ISP disconnecting

I currently have sonic.net as my ISP. Every 5 minutes i disconnect from the internet and almost reconnects instantly. This is very irritating for some applications and games. I figured it was because Sonic.net renews their DHCP every 5 minutes and my router somehow blocks the renew causing the disconnect. Any ideas on how to fix this problem? My router is WRT54G, Firmware Version: v1.00.9 .
 
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