MacBook Pro keys stop and start working sudenly

I have the Macbook Pro 13 "end 2011 with Osx El Capitan every time I turn on my mac, certain keys do not work as (A, F1, Backspace) I connect an external keyboard to type my password to the user, use like 3 minutes with external keyboard and laptop keys suddenly start working again, what is it possible already tried Reset the SMC and Landau."

I also noticed that this happens whenever I have close the session of the user or shutdown my mac

Tags: Notebooks

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