MY CTRL key problem

My left CTRL key does not work all time when I press the CTRL and the "C" or "X" key.
Sometimes If I press the "C" or "X" key twice with the CTRL key it works.
I changed my keyboard with the same results.
I tried to update the drivers, but the system stated that they were up to date.
If I use the right CTRL key with the "C" or "X" there is no problem.

Just wondering. Is there a reason you created a new user to ask the same question?
In neither thread do you say what kind of keyboard nor whether is was wired, wireless, or bluetooth.
If it's one of the latter two, the first thing to try is a known good old fashiond usb keyboard with no other keyboard or KB receiver connected.. If it's bluetooth, unpair it before testing with a usb KB..