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?
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

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.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Wireless Networking

From novice to tech pro — start learning today.