My Y, U, I, O, P  keys stop working 2012 MacBook Pro

Hi there.  I'm having a very frustrating time with a MacBook Pro.  After about 20-25 minutes use, the Y, U, I, O, P keys become very unresponsive and then after about 30 minutes they do not work at all.
I then have to power down the MacBook for an hour or so before they will start working again.
Can anybody suggest how I can fix this issue? 
Lee

"It does not seem to be hardware related, but seems to be associated with the software and auto correction or something like that. "
So see if you can go to an earlier OS or Time Machine backup prior to the update.
Otherwise here's an analysis I did of a keyboard failure of those exact keys.
Here's a picture of the traces on the upper membrane which is why it's a mirror image.
You can see how all the keys are interconnected such that a failure of the "E, R, T, Y"  trace would cause the entire set of keys to go down.
The interconnecting trace is about .5 mm wide so the tiniest anything will cause problems.
Here's a picture of corrosion on a trace that was causing an intermittent problem:
and here's a very enlarged of the contractor area of an "S" key that was driving me nuts. It would automatically add an "s"  at random times. Sometimes it would just start typing "sssssss" while the curser was just parked on a line.
The tiny hair was what was causing the problem. It would take closer examination to determine if it was a metal fragment or an ordinary hair. (We have a cat.)
I would need a microscope stage and a nano probe to determine if it was resistive (conductive) or not.

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