Laptop wireless cards mysteriously disabling

We've got a single school with 45 Cisco Access Points (Aironet 1142N). All Windows 7 ENT 32bit laptops. Lenovos and Dell Lattiudes.

We're seeing students leave the school for the day, come back in next day and for some of them, the wireless cards are just disabled.  We enable them and they're fine.

This happens every day....both Lenovo L420 and Dell Lattitude E5410

I can't nail down why this is happening.

Thoughts?
ejcristAsked:
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Networking_EnthusiastCommented:
Hi,

Certain operating systems have been known to have this issue with certain wireless card drivers; check out the following two links:

http://forum.notebookreview.com/dell/127252-wireless-just-turn-off-automatically.html

http://www.notebookforums.com/t/197326/new-intel-wireless-drivers-for-4965-3945-11-1-0-100
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wblunaCommented:
I found a problem with some Lenovo laptops that was very strange.  For some reason, the laptops assigned a removeable drive letter to the wireless card.  When students would go to "Eject" their thumb drives, if they chose the drive assigned to the Wireless card, it "Disabled" the wireless card, and the machine had to be rebooted.  Not sure if this is specific to a particular model though.  Might ask some of them if they are ejecting thumb drives, and check for a "phantom" removable drive.
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ejcristAuthor Commented:
We're thinking now its the NIC power management.  When we disable allow windows to turn off this device to save power, it appears the nic doesn't disable.  Is there a GPO that can do this?
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ejcristAuthor Commented:
Found the problem on our own.
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