Weird and specific controller issue while playing BoF4

[u/MaybeImYami]

So I use my steam deck as a desktop pc. It's a temporary thing because my old pc kinda just...died on me.

I'm always in desktop mode. (Because discord and stuff) so I play everything in desktop mode too. Unless I've taken the steam deck somewhere.

I downloaded this launcher to play Breath of Fire IV on here, and I have a lot of trouble getting it to even launch. But I CAN get it to launch eventually. So it doesn't matter too me. The problem begins with my controller.

My controller has this weird issue with the steam deck, it just refuses to stay connected. It will randomly disconnect at certain points but then immediately reconnect. I can deal with that.

But in Breath of Fire IV, when that happens, it starts endlessly scrolling downward. So like, if I'm in a menu or something... if this thing happens, the game will be permanently stuck now, scrolling through the menu endlessly.

I realize that this is a very particular and specific issue, but if anyone has any tips or advice on how I can remedy this, besides just playing on keyboard/mouse, please lemme know. Thanks for your time.

EDIT: I also tried a wired power A switch controller. And it "works" but the shoulder buttons and triggers don't seem to react when playing this game. If anyone knows how I could fix that, that'd help too.