Take it from me. I had the exact issue. I got my deck, and it immediately had that problem. It’s a problem with power delivery to the GPU I believe. It can even be checked if you look at the kernel logs you’ll see GPU error. Sorry to hear it’s still an issue with decks. RMA that poor thing.
Nintendo literally created a patent this year and waited for it to get approved before suing palworld a month after. Clowns over at Nintendo.