IMac (imac11,2 and imac9,1) disconnect from CISCO wireless on OSX 10.6.7 and 10.6.8

Just wondering if anyone is having connectivity issues with CISCO WAP (wireless access point). Our iMacs (intel inside) have both 10.6.7 and 10.6.8. I do see that there seems to be many with connectivity issues but not sure if this should be under hardware or OS.
The issue begins with the airport symbol still connected (or looks like) to an SSID (hidden or unhidden - both same results). It is hanging on to the SSID waiting for connection. I really don't know what's going on network side as I was not given permission to look or even monitor the network to look for this kind of issue. Doesn't matter what is being activated on computer, at some point the computer is disconnected from WAP. This seems to be happening all over campus. Same machines and OSs.
Last year everyone was on 10.6.7 and there were no connectivity problems.
Although changes were made to network, there was one two month period where all computers were updated and returned to clients. On the first day, they all got disconnected. During the summer, a class and two teachers were using the updated computers with no disconnects. First day of school, previously mentioned, everyone got disconnected.
It is now evident that 10.6.7 and 10.6.8 have disconnectivity issues. The anomoly here is that when I stream something to see if a disconnect happens the computers do not get disconnected. As soon there is a chance for idling to happen disconnects seem to happen.
Now I know it looks like the network. I am trying to poll the community to see if others have experienced any of these problems as well. I want to know if this is a machine problem, an OS problem, or a network.
Network engineers who came to troubleshoot could not replicate the problem and point to 10.6.8 because there are so many in the community who complained about disconnects.
Any help would be appreciated.

Hi
Is everything else running on the iMac OK (just Logic 8 not working)?
http://support.apple.com/kb/HT2375
Did you check all 3rd party plugins and drivers are OSX.6 compatible?
Have you tried moving the Logic preferences file out of <user>:Library:Preferences and re-starting Logic?
Have you tried starting Logic with Core Audio disabled?
How did you install OSX.6.7: Combo updater or via Software update?
Maybe you can post a crash log here to give some clues?
CCT

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