Keyboard lag

Hey my prob is that when im out of league my keyboard is working perfectly! but when im ingame after the first min the keyboard will start lagging af....and i mean that if i press "q" the cast will be delayed 7-10 secs later or mayby never, but that happens in all keyboard functions, if i "ALT+TAB" it will happen after a long time, or if i press the function key for led lights to turn off it will take a while to turn of and reverse...I tried to change the usb port or change even keyboard but this still happening. I trying to find some help sicne crhistmas. thanks for reading
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