Roku Ultra (2024) Wifi Connection Issues

I have all my Roku players connected to WiFi, since the wired connection on my Ultras is only 100 Mbps (Fast Ethernet). My Ultra 4850 is just fine on WiFi, and gets about a 330 Mbps connection. I do have multiple access points in my home, and the one the 4850 uses is within 3 feet, so about ideal conditions. But my 4800 is two rooms away from its nearest access point and it too remains connected.