Ctrl-key gets locked (stuck) when it is held down for a couple of seconds

Hello,

I am using a Surface Pro with Type Cover.

When I am selecting multiple items e.g. in Outlook or Windows Explorer I apparently hold down the Ctrl-key and left-click the items with my mouse.

When I select many items it takes certainly a while to select -- if that time span is let's say 10 seconds (may be it's just 5 sec) then my CTRL key locks, meaning, I do not have to hold it down in order to select multiple items. Problem is that you e.g. can't even hit the Windows button on the keyboard and not even the hardware Windows button on the Surface. If your machine falls into Sleep mode you cannot type the password any more. You have to reboot.

It took a while to find out that the Ctrl key was the trouble maker -- then after identifying it as such I tried to unlock it by hitting it 1 more time which works.

So, that is a remedy, however, if you do not notice that the Ctrl key gets locked then your machine also slows down, even the Task Manager (e.g. Performance tab) doesn't update any more. That looks like an overload -- may be because Thousands of 'key down' messages are processed, even if the key is not pushed any more? Just a speculation.

One more thing: the Ctrl key gets only locked when I make the selections with the mouse -- if I select them with the Surface Pen the Ctrl key gets NOT locked.

BTW, I tried two mice: bluetooth and wi-fi -- both deliver the same result, it doesn't matter.

Anyway, I am not aware that something like a 'sticky key' would exist for the Ctrl key? Does it? At least I have not turned on or seen such access feature activated. Also, no, my keyboard is not filled with crumbs. And it is unlikely that it would lock when I use the mouse but not if I use the Pen...

And the Ctrl Lock-down seems wrong -- is it?

Type cover bug? or am I unaware of the 'sticky key' feature?

Frank