Xbox One S - Games won't load, kicked to Home Screen

Xbox one S, less than 2 years old. My son's Xbox, so games are mostly disc games and Roblox.

I've looked at multiple posts here and on Microsoft and didn't find an actual solution. So, it started with the "Game took too long to load" and then the Xbox would freeze. Unable to go Home, quit the game, etc.

I tried the hard reset (hold the Xbox button on the console down for 10 secs, unplug, then try again).

I then did a factory reset, but kept the games and saved info.

Then I did a full factory reset. Nothing on the Xbox at all. No apps, no games, nothing.

I also signed out my profile. No help.

I loaded RDR2 because that works on my Original Xbox One upstairs. After waiting for the download and the online download, I get all the way to the load screen of the game (Honey Comb spinning in the lower right corner and picture screen) and then the screen turns black and I am returned to the Home Screen.

I did another full factory reset and loaded PubG. Same issue. Make it to the loading screen and get kicked back to the Home Screen.

I am at my wits end. I don't know how to get this POS Xbox to work. And besides the remedies I have already tried, I have not seen any answer to this.