Cisco Wireless and Mac's

We have a Cisco Wireless Controller, model 4402 with both b/g and a/n.  The AP's have the latest IOS.  We have two SSID's available- one for the private network and one for a public network that provides only internet access.  The DHCP server for both wireless networks runs off of the controller.  We have a class B network for the private network and a super-netted class C, 500 ipaddresses for the public side.  The problem is that over a few weeks Macbooks lose the ability to access the  internet over the public network. They get a correct IP address, gateway and DNS server however, they are not able to ping anything on the network but can ping themselves.  A Macbook could work today but then not tomorrow.  We sort of resolve the issue by rebooting all of the AP's but would like to resolve the underlying issue.  Any ideas?
cssunetadminAsked:
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nappy_dThere are a 1000 ways to skin the technology cat.Commented:
The issue typically are the APs. No matter what brand you have a reboot is necessary. At home with my dd-wrt unit i reboot once a week. At work, I reboot when users start to complain.
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