Problems accesing internet using wireless and WRT54GV2 router

I have mi Dell computer using a WUSB54GP adapter is wireless conected to my WRT54GV2  router, but some times a can not access internet anyway i can connect to 192.168.1.1, so i restore factory defaults, and shutdown the cable modem and the router, this fix the problems, but before some days, i have the same problem, so i have to restore the factory defaults again.
Note: if i wired my pc to the router i can browse internet, so i think the problem is only with the Wireless configuration.
Any Idea.
Thanks

Hi, I have had the same problem with my router since last week when I upgraded to the latest firmware, see my posts on this thread

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