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Sounds like your cntrl key might be getting stuck..
A couple of things you can do. you can take the key off, and clean round the key. And Believe it or not, you CAN put the keyboard in your dishwasher, but you have to shake out the left over water and let it sit for about 4 days.
Also try a good dust cleaner to see if that will help.
you can Buy a can of compressed air and spray it on the keyboard if your keys are sticking together. This is the easiest thing you can do to fix the keys on your keyboard. It doesn’t work for all problems, but it’s a good place to start. Make sure you get the air down inside the keys to clean out any debris, hair or food that may have gotten caught in there. Or try to replace a new laptop keyboard.
Apparently whatever the manufacturer is using for a conductive material reacts with the air to form an oxide or film that interferes with conductivity. This is not a permanent solution to an engineering problem. I have several times taken the keyboard apart (little screws on the back), removed the bubble plastic layer, pealed back the layers and then wiped the "electrical key contacts" with a cotton cloth dampened with isopropyl alcohol. Put it back together and problem fixed-- for a while.
I think i've worn enough of the very thin material off that I can't do that anymore. Which is why I ended up here. Good luck.