Networking issues following upgrade to 10.5.8 when iMac wakes from sleep

Hello,
I recently upgraded to 10.5.8 and I'm now experiencing issues with network connectivity following the iMac waking from sleep. I have to stop Airport and then start it again to resolve the issue.
Can you provide any resolutions to this or advice?
Many Thanks,
Sam

Reinstall the Mac OS X 10.5.8 Combo Update because the Combo seems to help a lot of people when a Delta upgrade doesn't take right.

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