Yesterday my laptop started to do strange things. The keyboard is not working properly, when I press "U" it shows me "U3", when I type "r" in notepad it's writing " r" with space. After a few minutes the keyboard works fine, this is the weird part. When I was trying to check all the keys, the screen brightness starts to go up and down. The laptop is taking longer than usual to respond.
It can be from a virus or the keyboard is the problem? Thanks in advance.