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The keyboard is the problem. Keyboards work off a scrolling matrix, so if only a few are not work then circuit for that particular key is broken. Usually by something being spilled in the keyboard or because something was dropped onto the keyboard or the user likes to pound on the keys when entering key strokes. Replace the keyboard.
It's possible there is a mechanical problem with that key (broken, dirty).
But just in case you also use a usb keyboard with the laptop make sure that you did not disconnect (the usb keyboard) with the number lock engaged. If so you can either use the virtual keyboard to disengage the number lock or reconnect the usb keyboard and disengage the number lock. Then check if the problem is fixed when the usb keyboard is disconnected.
i have the same problem.
I run the windows screen keyboard and i discovered that when i press
both r+t keys and u+y both shifts are switching on. i'm not able to switch
it off even using mouse on screen keyboard.
as temporary workaround i press fn key then i press shift on screen keyboard, then both shifts switches off.
i didn't fount full solution.
You need to clean the keyboard. Blow it with air blower so that the paricles inside keyboard will be eliminated. If not work, then you disassemble the keyboard and clean the key one by one. afraid to do , then let the repairman do it for you or you can attach USB keyboard for the laptop.