is this what you have?
Dell Inspiron Duo Convertible Tablet with Intel Dual Core 1.5GHz, 10.1" Multi-touch Screen with WebCam, 2GB DDR3 Memory, 320GB Hard Drive, Windows 7 Home Premium
Since it looks like a laptop, I would not try taking the keys off. They have delicate, easy to break parts underneath.
Did You try seeing if there is a CPU spike when the problem occurs as I suggested previously?
I would go to this page and enter the service tag to see if there is any warranty left.
The service tag should be on the bottom of the laptop.
This is a link to the Dell Service manual
Looking in the service manual I see that the Keyboard is easy enough to change. I saw the in the $30 to $50 price range when I looked on the Internet.
So I suggest checking the warranty, If it still has warranty, that would be the best way to go as I suspect that Your keyboard is bad.
The best test would probably be When the Dell Logo appears, start hitting F12, Then choose diagnostics. Test the Hard drive and I think there is a keyboard test. I don't have one in front of me to check with.