ISB7000 won't stay connected

Jeffermc

@danamherring I'm going to guess that your DVR is connected to port 1 because it has the most data flowing to it (15.3GB) and the highest multicast packets sent out it.  There are very few errors showing on the Gateway side on that port; there's no way that I know of to check the receiver's error counts.  Your network error counts are showing just a few FEC, so that looks good, too.  You do have two pretty long circuits (i.e. you're dual pair).  The attenuation is high, but the noise margins are fine and you've got good sync rate margins above what you're using.

It looks like that data is transmitting from the network to your Gateway fine, and to the extent we can tell, from the Gateway to your DVR fine.  So... why do you have an issue?!  Let me think on it.  If you can think of any other details to share while I think...

@gailkb97  I always ask about the power because of a personal experience: My TV and Receiver were both spontaneously rebooting at the same time.  I was blaming the receiver for rebooting and taking the TV with it... until I realized that they were both plugged in to the same UPS and found that the UPS had a very low battery and was briefly dropping power to both of them, then resuming it without any beep or other signal.  The receiver and TV were both fine when not plugged into the [failing] UPS.

Instead of a power problem, your TV could be shutting off because of an internal TV problem.  It could be shutting off because it's receiving a command via CEC over HDMI (i.e. the Receiver or some other device connected to the TV is telling it to).  It could be shutting off because its receiving an IR command that it thinks is telling it to power off (e.g. from a remote control or an IR blaster).

Here are a few troubleshooting steps you can try in whatever order you'd like:

• Disconnect the AT&T TV Receiver from the TV's HDMI jack and see if the TV turns off by itself when not connected to the AT&T TV receiver.
• If you have any other device (AppleTV, Chromecast, FireTV, etc.) connected to that TV, temporarily disconnect it and see if the problem goes away.
• Find the IR receiver on the front of the TV and cover it with something that will block all light to it so you can make sure there's not an IR signal getting to it and see if that fixes it.

@JefferMC:   

• Not sure what a "UPS" is ?  The Power Strip is plugged into Electric Socket - not using a battery, so not sure what you mean?  
• Nothing else is connected to TV ... just the AT&T Receiver Box.  
• There are no jacks or connections labeled "HDMI"
• I have completely disconnected & unplugged several times to try to get to reset. (The TV, the DVR, and even the coax connection to the wall)

Also ... thank-you for all you advice and trying to help me fix this.  

A UPS (Uninterruptable Power Supply) is a device that you plug into the wall, then plug your device into.  It has a battery to supply power when it's not getting power from the socket it is plugged into.  The fun thing is when it has problems and causes your devices to lose power even when the wall socket has power.  Which is what happened to me.  You apparently don't have one, I was just letting you know the sorts of strange things that happen that drive strange questions.

What kind of cable do you have between your TV and the U-verse Receiver?

@JefferMC: Thanks for all your help. I really do appreciate all your suggestions and wanted to let you know not to bother with this anymore as an AT&T Tech is coming out.

Just read your previous answer so thanks for the extra knowledge!  Yes ... strange things do happen !  Take Care ... :)

I suspected as much ("Instead of a power problem, your TV could be shutting off because of an internal TV problem,") but I didn't want to conclusively say that until we'd exhausted other possibilities.

I'm assuming you tried something like a DVD player or game console to further troubleshoot.