Multiple Wireless Clients with packetloss - started on Patch Tuesday

We have a 4402 WLC that has been running 7.0.230.0 code for 90+ days without issue. There is a mixture of 3502 and 1142 AP's on a campus style complex. Starting May 15 2012 we have had an influx of calls from the wireless users having major packetloss when on wireless. The odd thing is that it is not all users and it is only occuring on one of our SSID's (the most important one).
So far TAC says there are no know bugs that match this issue in the code. We dont think it is code either since for months we have been stable. We have upgraded the wirless drivers on several of the machines running W7 and those seem to be more stable.
The big question is WTH caused all of these clients to have driver issues when they were fine last week?

Sean,
why do you say that it´s a packet loss situation?
DS

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On several workstations I use multiple network to
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Multiple Wireless Clients with packetloss - started on Patch Tuesday

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