I have a video for you. It's easier to show than tell.
When in Bigbox, the software stops reading my gamepads for about 1.5 seconds every 3 seconds.
Bigbox reads keyboard inputs perfectly fine.
This happens with every theme, in every category and in the options menu.
This happens when I'm using video previews, image previews or neither.
I've tried multiple controllers and it still happens.
The controllers work fine in games.
Yes, I've rebooted Windows. I've closed every other piece of software running in the background.
I've been using Bigbox for years, but this just started with my new PC build.
Windows 11, Ryzen 9 9950X3D, Radeon RX 9070XT, 64g ram, All drivers and software up to date.
Here is a video I made showing off the issue.