The problem I'm experiencing is on every Wi-Fi network I've tested it with. I first noticed it because the wireless Android Auto setup I use would cut out every minute, but every other Wi-Fi network I've tested has been the same.
The only way I noticed was by monitoring the network traffic from a Wi-Fi router to the device and seeing the device fall off the network every minute. If the device has another method for internet (i.e. cellular data) then it shows the 4G/5G symbol, otherwise it continues to show the Wi-Fi symbol as it drops out for such a short time that the Wi-Fi symbol does not disappear.
So far all Wi-Fi networks I've tested have been the same, so it's interesting to hear a hotspot connection works. I wonder if it's something to do with using a 2.4GHz vs 5GHz, perhaps?