I have the same issue. I get a „lost internet connection” message every now and then. After some research (google&reddit 😋) the issue for me is that I’m surrounded by WiFi. WiFi routers, direct connect tvs, printers, even some soundbars have WiFi, smart home accessories. Even though most of these networks are hidden they cause interference. You can try to change the WiFi channels on your WiFi access point but if it’s like mine it won’t help. My solution was to get an WiFi extender (don’t get cheap ones they mostly help over a very small distance).

I suggest you to troubleshoot and if possible move the Apple TV closer to the WiFi access point.