X200s Wireless Randomly Turning off Causing System Freeze

Hi,
I've run into a problem recently with my 2009 x200s running Windows 7 Home edition.
Over the last day I noticed that after doing between 5-10 minutes of wireless web browsing, the system freezes. The exact moment this happens, I also notice that the wireless indicator just below the LCD goes from active to inactive. Further, while no amount of key-pressing does anything, including ctrl-alt-del, I can, amazingly, turn on/off the thinkpad lcd nightlight! The only way to recover from this is to press down on the power button for 5 seconds and reboot.
Then, 5-10 minutes later, the random freeze repeats. That is, with the wireless indicator light doing from green to dark.
By the third time this occured, I got a hint. I checked the event logs for anything unusual. Nothing.
I'm running a current version of Avast! antivirus and ran a Malwarebytes scan, again, nothing!
I'm at my wit's end. Any ideas from Lenovo gurus?
Help!
Best,
Dave

Ok, an update.
The freezing occurred while working in the library. That hadn't been a problem previously. So, why today?
I went home and tried it again. Everything seemed to work fine.
So, I guess my question now is this: Why would my x200s wireless connection stop working in a public access point causing a freeze in Win7 while working just fine at home??
Odd....

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