My macbook pro just randomly shuts off when i place my mouse on the right corner

I set up the right corner of the screen as showing all the windows that are open

so i often place my mouse on top right corner to go to the internet page or word or anything i opened.

but by doing so, it randomly shuts down the laptop screen

and my music (if i turned on) goes weird like repeating the word constantly.

what is wrong with my laptop?

it happens at least once everyday and its bothering me now.