Bug with game controls

Hello, I have this problem:
Bug with the game keyboard. So it's like this: I'm playing in my world when I suddenly start to walk back, left, right, jump and shift, without pressing the keys: W, A, S, D, shift and spacebar.
This is very unpleasant because I can not play quietly.
Please, I wanted Mojang to give me a light.
Thanks for listening.