Keyboard [shift] and [alt] didn't work correctly

Hello, this is my first time using Manjaro. Everything in software is ok but that’s no the case with my keyboard.
My problem is when I try to change the windows using alt+tab and it didn’t work as well as I wish, when I push the alt key it duration is only one or two seconds and its a problem when I have a lot of windows opened because I can’t change the window using the keyboard.
Also the shift key has the same problem, when I wanna write capital letters using shift+key sometimes didn’t work.
If someone can help me to solve my issue, I’ll be really grateful.

P.D. This is my first time using Linux as my principal OS, when I have Ubuntu in a dualboot I’ve never had this problem.