I’ve run into something similar on my Apple TV 4K before, and it drove me nuts too. When the screensaver gets stuck on one location like the LA night aerial, it usually means the aerial video pack didn’t finish downloading, even if your connection is fast.
A couple things that helped me:
1. Check the Aerial download setting manually
Go to Settings → General → Screensaver → Aerial → Download New Videos and make sure it isn’t set to Never. Sometimes it resets after an update. Switching it to Daily forced mine to start pulling new clips again.
2. Change the Screensaver type temporarily
Switch from Aerial to another style (e.g., Photos or Apple Photos), back out, then return to Aerial. That refresh kicked it back into downloading for me.
3. Make sure the Apple TV isn’t in Low Data Mode
If your Wi-Fi network toggled this on at some point, the device won’t fetch any new screensaver videos.
4. Try a different network—just once
Even a mobile hotspot can work. I had to do this after a tvOS update because the device refused to download aerial videos on my main network, but downloaded instantly on another.
5. Sign out/in of iCloud
Weirdly, this solved it for a friend when nothing else worked.
It’s super frustrating when everything else loads fine but the screensaver won’t budge. Hope one of these gets it unstuck!