uverse tv say network setting changed, will restart in xx minutes. I did not change anything.

This normally means the Receiver has lost connection to the network.  Is your Receiver connected via a Coax cable, an Ethernet cable or via Wireless?

Jeffer, it is wireless.  I have lost tv connection many times before but it just tells me to restart.  This is first time it said the settings were changed.  It give me the option not to retart - restart now - or wait for the automatic restart.

If I were in your situation, I would:

1. Unplug the power on that receiver and all other receivers (including the DVR)
2. Unplug the power on the dedicated WAP for the wireless TV receivers
3. Unplug the power on the Gateway, and wait 30 seconds
4. Plug back in the Gateway and wait 3 or 4 minutes for it to boot up and start working
5. Plug back in the DVR and give it a few minutes to come up and start working
6. Plug back in the WAP and give it a few minutes to come up and start working
7. Plug back in the receiver (and any others still unplugged).
8. Check to see if it works.

I understand how to do all this IF I don't have a WAP.  If I have one, I don't know what it is.  I have a gateway, receiver, and dvr and that is all that I know of.  (Yeah, very low tech, ha)

Possible that it lost connection during a firmware update? 

Almost all Wireless TV installations have a WAP separate from the Gateway to which the U-verse wireless TV receivers connect.  There was a short period in some locations where AT&T tested using the Gateway's Wi-Fi capabilities instead of the dedicated WAP.  This configuration was found lacking and a separate WAP remained the standard. 

The WAP should be a separate device connected to the Gateway via an Ethernet cable.  It would be a Cisco VEN401 (1st gen), Cisco VEN501 or Arris AP-2500.  

My apologies for disappearing - I had to leave for an appointment.  The system restarted before I did anything and everything seems to be working.  I would like to understand what you have described.  I still do not think I have a WAP, as nothing is connecting to the gateway.  It connects to the receiver as do the other three cables.  I am attaching photos of the components.

So, the green cable is signal in from AT&T.

Where do the coax cable and the cable behind the wall plate with the white "data cable" end up?

What model number is on the Gateway?

The gateway is Pace Model 3801HGV FLX.  Photo shows cables as connected.    The receiver is IPH8005, 2nd photo.

A 3801?  How old school. :-)

So the DVR is the IPH8005, which is connected via coax.

So, the white cable goes to the wall and something connects to the wall in some other room?  PC?

Okay, mystery is solved.  You only have one receiver, it's not wireless, it's fed by coax.  The only reason I kept looking for your WAP is because you said

Jeffer, it is wireless

DVRs can't be wireless.  And I zoomed in on the back of the 3801 and I see that the white cable with the label "DATA CABLE" going into the wall is your back fed dial tone (i.e. you have AT&T Phone and the 3801 is where your phones plug in).

MyThoughts, I will print that out and see if I can arrange for an upgrade.

Thank you for the details!

So this is a thing.  You didn’t do anything to cause it.  I wouldn’t worry about it either.  
If you plan to stay with att as your ISP, I’d think about the suggestions to get a more modern gateway, and for extra credit, invest in a solution that doesn’t rely on coax wiring.