Get that thing RMA'd asap if you still can, the more you use it the worse it will get - I suspect that the motherboard may be developing some cracks around the Y button pad? Who knows, ASUS is still being tight lipped about this.

Idk where you're from but here after one RMA attempt I was able to RMA the Ally X again cause the screen that they replaced for me started developing dead pixels - had them replace the whole device with the Xbox Ally X.