letter "m" stops working randomly

  portugal.thefan 18:14 22 Jan 2018
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so yesterday i noticed that my letter "m" stopped working and im sure i dont have a faulty keyboard because when i restart my pc, it starts working again, but then a minute later it stops working. my pc is pretty new as ive had it for probably a month at max. what i did notice was that when i tried using the letter "m" ingame, it seemed to be working which is really confusing. i tried a keyboard test online to see if it was my keyboard messing up but when i pressed "m" it was being registered but it wasn't being shown on the screen. any ideas?

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