Control key locked down intermitenttly

A very vexing problem, that sets my hair crawling in frustration for about one hour cumulatively, every month. (The approx length of time I waste on it when it happens).

I have a Samsung series 9 ultrabook, i5, 4GB RAM with windows 7 home premium, all updates installed. About 6 months ago I noticed this problem- every few days, out of the blue, the keyboard started acting up:

basically it seemed like the control key is pressed down even though its not; a reboot always fixes it, but its highly...

Control key locked down intermitenttly

Control key locked down intermitenttly