(On XS Max) I know another user reported issues with download speeds using the XS Max on WiFi, I have the same issue I think. When I read his post, I tested mine and I was getting 80 Mbps d/l right next to an iPad getting 505 Mbps and an iPhone 8 getting 480 Mbps. So as he suggested, I rebooted - and I got 470 Mbps, so I wasn't worried - still probably doing stuff. But I noticed this afternoon a picture has been stuck uploading to iCloud for over an hour, in Photos - so on a hunch I tested again, and back to 80 Mbps. When I powered off/on, brought up Photos, the photo had uploaded. But, in Speedtest it is only getting 87 Mbps. I forgot the connection and restarted, and I got 570 Mbps. But then, two more times, with the iPhone not obviously doing anything, it was back down to 80 Mbps. Other times, it is 480 Mbps - 570 Mbps. I checked, and it is on a 2.4 GHz connection again. I think it slips from 5 to 2.4 periodically, I guess this is a bug?