Keys hang or stop working

Hi,
MacBook Pro 3GHz i7, OS 10.9.5
In the middle of working sometimes the keyboard freezes. Sometimes a single key repeats like crazy, today a single key just stopped working. In these cases the only solution seems to be to restart the computer, sometimes it needs to be restarted several times to have the keyboard start working again.
I found a thread suggesting to close the screen for a minute, but that does not help much. Restarting seems to be the only thing that works.
Any ideas?
Hans

I think I solved it myself...
so it seems that I had the beta version installed... and I just install the release version over that...
I remember this problem existed in the beta version too.
so what I did was uninstall release facetime and reboot.
then install with facetime.dmg (beta version)
then uninstall again by dragging the beta facetime.app to the trash bin and reboot again
then install again the release version.
everything is okay after that...
oh one note... I did log out before every uninstall.
Thanks

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