DNS seems to drop from msm720 controller

Hello

I'm having a strange issue with my HP MSM720 wireless controller. my users will be working over the wireless and suddenly will lose DNS or the internet will become very slow. this is driving me crazy. I've upgraded the firmware on controller and APs.

please help
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Rich WeisslerConnect With a Mentor Professional Troublemaker^h^h^h^h^hshooterCommented:
To clarify the problem:
"my users [...] suddenly will lose DNS": The user's client machines lose their local setting for DNS, or DNS service on the msm720 stops responding to wireless connections.  (I assume the clients are using the msm720 for DHCP and DNS.  Assuming you do use DNS from the box, do you have DNS cache enabled in advanced features?)  (From a client experiencing problems, if you perform a nslookup against the DNS server?  Using nslookup, change 'server 8.8.8.8' and see if you can look something up against google's DNS server...)
I believe there are a couple wired connections as well... do you know if the problem also occurs to systems connected on the wired port?  
Does anything appear in the logs on the msm720?
Any errors?  (Either on the boxes or on the client machines... can check 'netstat -e' at a minimum.)
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Rich WeisslerProfessional Troublemaker^h^h^h^h^hshooterCommented:
The most I can offer is an incomplete solution (a set of questions) which may help troubleshoot, or at least guide you in the direction of a more complete solution.
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