Some keys stopped responding apparently after latest update

Dear all,
all of the sudden, apparently after the latest update, some keys on my native keyboard stop responding from time to time. Mostly I can verify the problem with the a, s, k and l keys. It seems that pressing the combination ctrl+alt solves the problem for some time.
What I tried was
- checking the Activity Monitor for processes that take a large amount of CPU -> no.
- performing a P-RAM reset -> problem disappeared for an hour or so.
- safe mode, restore permissions -> did not have any affect at all.
It also seem that the external keyboard works without any problem (bluetooth).
Any hint or solution?

It's possible your macbook keyboard needs cleaning out. If you eat while using your computer, crumbs could have gotten underneath the keys. You should visit the macbook forums for instructions on keyboard cleaning in case that is the cause of your problems.

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