10.5.4 update and decreased wireless sensitivity??

Ever since updating to 10.5.4. I have noticed that the macbook seems less sensitive to picking up nearby access points. A lot of AP's that I used to see show up in my neighborhood on 10.5.3 no longer appear in the wireless scans... although some do sometimes. Overall though I see decreased sensitivity... is anyone else seeing this?

I too have a MacBook (purchased 12/07) showing the same symptoms, but it didn't start with 10.5.4. The decreased sensitivity started a couple of weeks ago. Wireless connections used to be rock solid and stable. Now, not only can I not see other networks in the neighborhood like I used to, the networks in my own home come and go and sometimes there are connection errors.
I have an Airport Express module in the same room as the MacBook... sometimes the MacBook sees it, sometimes not. Same with my primary wireless router... sometimes the Macbook doesn't see it, and, when waking from sleep, it takes longer to connect. Used to be pretty much instantaneous. Now I have to wait.
I just updated to 10.5.4 today hoping that might make things better, but there has been no change, better or worse. I am thinking that it's a hardware issue, like something wrong with the Macbook's airport circuits. I hope not. I don't have faith that Apple will fix it properly.

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