Internet keeps going in and out - "unable to clear ARP Cache"

I recently upgraded my WRT54GS firmware to ver. 4.whatever the most recent is. I also secured the wireless router using the WPE key. My internet connection on one of my wireless laptops will cut out for about 30 + minutes and when I try to reconnect to the network it says unable to clear the arp cache. This same laptop had no problems when the network was unsecured and the firmware was ver 2. whatever.
Any help would be appreciated as this laptop is used to work from home two days a week.

Hi...Try out a couple of commands from the command prompt:
"netsh interface ip delete arpcache"
"arp -d "
If that doesn't work. reboot.
let me know if this works for u...

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