T400 WiFi connection keeps dropping

My T400 WiFi keeps dropping the connection, and wonder if anyone has any suggestions.  When it drops, I've tried to reconnect by going to Network and Sharing Center, clicking on Wireless Network Connection and try to restore from there.
I get a repair window, then nothing happens.  The machine seems to lock up - I lose the task bar, the Windows button doesn't work, and I have to force shutdown via Ctrl-Alt-Del.  When it boots up again, the wireless reconnects without problems, but then will drop out again after a few hours.
I've tried reinstalling the most recent drivers for the wireless card, but to no avail.
Any suggestions, please? 

You can try either of these and see if they help.
Tap Settings, then tap Safari on the left side. Then on the right side - tap clear history, clear cookies, clear cache. Clear all three. Reboot your iPad. Hold down on the sleep button at the top until the red slider appears and slide to power off. Then hold down on the sleep button until the Apple logo appears and the iPad will restart. Launch Safari and see if helped.
If that doesn't help, try this. Tap Settings, then tap General on the left side, then scroll down on the right side and tap Reset, then tap Reset Network Settings at the top. Reboot your iPad as described above. Go to WiFi select your network, enter your password and try again.

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