Macbook pro 2011 pressing random keys
My macbook pro early 2011 running macOS 10.13.6 is pressing random keys at random time. My laptop was sleeping and it wake up. On the password input i saw random letters (i actually cant see if it is letter on number or which number or letter it is). I tried rebooting my laptop. It fixed, but in around a hour the problem appeared again. I have also an external keyboard, if there is a way to disable the built-in keyboard. What can i do? Should i reset my macbook or it is a hardware issue? Please help!
MacBook Pro 13″, macOS 10.13