Laptop Keyboard Freezes

A friend of mine brought me his Dell laptop to see if I can figure out why the keyboard ocasionally freezes up and stops working.

I looked in the hardware manager and found no indications of a problem,. Started up the laptop and ran a few programs and no problem. Then I realized the cursor froze up and keyboard would not work as soon as I attempted to connect to a network. I couldnt even do ctrl/alt/del

Restarted the laptop and right away went into the network connection to connect to a network and right away froze again.

Anyone have an idea?
 
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