Wifi problems since installing 10.6.3?

in Genius Bar edited January 2014
I installed 10.6.3 the other day and ever since i've seemingly been having problems with my wifi on my MacBook. It says I have a full connection as usual, but every so often my net connection just stops. If i turn wifi off and back on again, the connection comes back.

It's not the internet connection because a Vista based Dell has no problems at all.

Has anybody else had this problem, or know or a fix?
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