Have you tried turning off Wi-Fi power management on the Deck? The Deck’s Wi-Fi is normally pretty good, but the Wi-Fi power management occasionally has issues with some combinations of router chipset and router settings, which can cause symptoms like what you’re experiencing.
What gaming console / platform do you prefer?
I’ve gone from PC to Xbox 360 to Nintendo Switch and very excited about the recent addition of a Steam Deck. Curious what y’all gaming on?