OSX 10.5.8 update - serious networking issue

I have noticed a serious issue which has started happening AFTER I installed the OSX 10.5.8 update (from the combo file).
I have a cable modem and 2 computers (a MacPro and a PC) connected via an Airport Extreme router. Over the last week my ethernet network on the Mac side disconnects (no IP found) and my internet disappears. The internet connectivity is fine on the PC so it has to be related to an issue on the Mac.
I can resolve this problem by disconnecting and reconnecting the Airport Extreme to the power.
Has anybody else seen this??
Peter

I have a similar issue. I lost the ability to connect to my PC. Worked fine, then just disappeared. Internet works fine but but the ability to connect to the PC to move files is gone??? Triple checked everything. Totally lost!

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