Wifi problems with my MacBook

Hi all
Is anyone experiencing Wifi issues with Snow Leopard 10.6.4?
I have picked up some problems with my MacBook when using Wifi - if I ping my wireless AP (a Linksys WRT54G), some packets are lost, and general network access is very slow.
The network is 802.11G using WPA2 - I also have a Powerbook G4 here which loses no packets doing the same tests, as well as a Windows 7 desktop that shows no problems either.
I have spent hours troubleshooting, and am no closer to an answer. Have tried many steps recommend to fix previous wi-fi issues, such as resetting flash with the option-apple-p-g key combination at boot time, deleting settings and setting up the wireless again etc. etc.
Would be very useful to know if anyone else has these problems , or else I am about to re-install the OS.
Any help appreciated.
Ciao

OK solved the problem!
A firmware upgrade on the Linksys did the trick. I had revision 5 hardware with version 1.51 firmware - upgraded to v1.52.8 build 001 and everything is back to normal.
Why only the Macbook on my network was affected, who knows but I suspect this may have been a recent software update from Apple that triggered an incompatibility.
Anyhow hope that is of use to someone!

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