Since updating to OS X 10.6.5 my wireless on my 4 year old MacBook Pro has been dropping out quite a lot. I’ve found a simple solution that seems to do the job and get it working again.
- Boot into safe mode - Hold shift key after chime sounds and release at the grey screen
- Go into System Preferences and find Network and remove Airport from list - Click on the minus button at the bottom
- Restart back into normal mode
- Go back to System Preferences and add Airport back and re-connect to your wireless network
After doing this, I’ve ran a continuous ping in the Network Utility (found in Utilities) to the router IP address and since the reboot and reconnection, not one packet dropped.
Hope this helps if you’ve found your Mac to do the same thing after the OS X Software update to 10.6.5