My face buttons and bumpers aren't working

Yesterday I was playing (Halo Wars 2) normally on my Xbox One (fat) and for some reason my controller started to fail, the triggers and sticks were fine as well as the Home Button, but the d'pad, start and “select“ buttons, and the X Y B A ones are failing for some reason.

Are this related? Is a hardware or software problem?

Help please, I was planning on buying a headset but it looks like I'll have to buy another controller lol.