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Toshiba Laptop drop wireless and immediately reconnects

We have several Toshiba Satellite L450 Laptops that randomly drop the wireless connection. Internet Explorer will freeze, you get the pop-up window from the wireless connection icon saying that you are connected to the network and it then shows full signal strength. IE8 will not recover and the only way to re-connect is to reboot the PC. We tested with another (Lenovo) laptop and moved to all the same areas, with not a single drop of signal. We got updated WiFi drivers from Toshiba, but they didn't help. Any ideas?
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emc1952
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emc1952
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wwakefieldCommented:
What is managing the Wireless conenction?   Is it Windows Wireless Zero?  Or whatever shipped with the laptop?
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wwakefieldCommented:
If not Windows, try using Windows.

CONTROL PANEL>NETWORK CONNECTION

Locate Wireless adapter, Right Click>Properties>Wireless Tab and check "Use Wihndows to configure my wireless...."

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wwakefieldCommented:
If that fails, go to the Toshiba Driver site and update/reload your wireless adapter drivers.

If you have an external wireless card or bridge or USB dongle, you could test using that to make sure it is not something else.
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emc1952Author Commented:
Thanks for the input. Windows is set up to manage the wireless, and we have removed the Toshiba wireless utility completely. We downloaded the newest drivers from Toshiba, but the problem persists. Today we are trying a usb wireless adapter with an external antenna to see if that helps...(i don't see why it would because we show full signal strength when the problem occurs)  
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wwakefieldCommented:
I doubt if it is a DHCP issue, but try assigning a static wireless IP address.

That is a reach, but assume you perused Toshiba's web site for know anomolies.   Since it is more than one unit, might be time to call Toshiba for Paid Support (Or Warranty)
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wwakefieldCommented:
That last comment was just a grasp...   I am thinking support from Toshiba.  You have already dumped a bunch of billable hours into this.
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