Laptop keyboard's some keys not working .


I have a sony vaio s series laptop and some keys stopped working. If my laptop has been shutdown for 8-10 hours then every key work for 5-10 minutes and then some keys stops working.
I have tried to clean my keyboard from outside with a vaccum cleaner and it worked for an hour and then same problem persists. What could the problem be?

Please help.

I didn't find the right solution from the Internet.

http://www.tomsguide.com/answers/id-347 ... rking.html
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