Keyboard input lag, only gets fixed on restart temporarily

May 11, 2018
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HARDWARE:
8gb ram
Logitech mk270r (wireless keyboard & mouse on one usb)

ISSUE:
input lag on keyboard only.
a delay for half a second, doesn't stop and will register everything you press, registers the input even if you exit notepad already.

POSSIBLE CAUSE?:
Probably from using windows key instead of "alt-tabbing" out of a game,
because pressing the windows key opens up the start menu and the taskbar.
I'm not sure tho, I haven't tested it intentionally.
I have read about SuperF4 causing this input lag so will try deleting it.

FIXES I TRIED:
-a restart fixes it temporarily
-changing the batteries
-changing usb port
-using other keyboards
-turned off filter keys

It works perfectly like a proper keyboard when you go back in game and only in the game.
Still persists after closing the game.
 
Solution
Try reinstalling the keyboard drivers.

Download from Logitech and install per the installation instructions.

Your current driver may be corrupted.