ISB7000 won't stay connected

There is no "secondary DVR." It's a receiver.

It sounds like they didn't replace the problematic box, but the other two.

When it "turns off," what exactly happens?  Does the power light go out?  Does it display a message saying that it has lost its connection?

I am having the same issue.  It is only the main receiver/DVR.  It says it has lost connection.  If I change the channel and go back it comes back on.  If I just leave it, it will eventually come back for a few minutes and then does it again.  I have been on with support multiple times.  Replaced the receiver 3 times.  Just got off with support again.  Ran through all the same song and dance.  They are sending another receiver.  

@danamherring how is your DVR connected to the Gateway?  Via Ethernet or Coax?  If Ethernet, does it go through any other routers or switches before getting back to the Gateway?  Have you (or an AT&T installer) checked each connection along the way back to the Gateway (i.e. at each wall plate; if coax, behind each wall plate).

The DVR is connected to the TV via ethernet.  There are no routers or switches between them.  I had two different techs out to check all the connections.  I had this problem a couple of months ago and nothing fixed it.  Then one day it quit pausing.  Now out of the blue, it starts again.  

TO JefferMC:  My problem is a little different than danamherring.  My Main DVR Box is fine ... I am only having problems with the secondary receiver.  After 10 minutes of being on, the TV turns off & TV Power Light goes out. The Receiver Power & Link Lights both stay green.  Doesn't matter if I am playing back a recording or watching Live TV on this 2nd TV that has the ISB7000 Receiver Box only.  I have to leave it off for about 30 minutes, then I can turn it on again ... only for it to turn itself off in 10 minutes.  My TV is connected to Receiver via CoAx.  Then there is a white connector with Phone Jack ends connected from the Receiver Box into the Modem Ethernet slot.   I am very good at checking connections, and have redone at least 3 times just to be sure. Appreciate any suggestions you can offer.

TO JefferMC:   No ... It does not say it has lost the signal connection ... It just shuts off.  I have tried several times when it is working to do a "re-boot" by holding the receiver power button in for 10 seconds so the AT&T U-verse connection resets.  Doesn't help.  Earlier today it actually stayed on for about 30 minutes and I thought it was a U-verse Miracle ... LOL ... only to have the same problem continue with 10 minute increments and then shuts down.  I have actually timed it .... it is not just an estimate.

@gailkb97 I read your second post, wrote an answer, then went back and read your next to last post and erased my answer and started over:

• Your TV turns completely off?
• Can I ask if you could possibly switch your TVs between the two rooms to see what happens that way?
• What is your TV plugged into for power?

@danamherring , Do you have Fiber or VDSL2?  If you have VDSL2, would you go to your gateway at http://192.168.1.254/ , click on the Broadband tab and take screenshots of the tables with the data in them (sync rate, noise margin, attenuation and especially the error counts)?  This would let us see if you have a connection problem between the AT&T network and your home.  Also go to the Home Network tab, and take a screenshot of the "LAN Ethernet Statistics" and tell us which Gateway port your DVR is connected to.

Do you have a single pre-manufactured Ethernet cable that goes from the DVR to the Gateway or do you have RJ45 wall jacks and plug Ethernet cables into to them between the Gateway and the DVR?

@JefferMC : 

• Yes ... TV turns off completely & Power LIght goes off.  
• No ... Not possible to switch TVs because I have a large screen TV downstairs and a small TV upstairs. 
• TV is plugged into PowerStrip which is needed because that is where Modem is also located upstairs & need additional "plug ins".  Yes ... I am confident PowerStrip is working as I just replaced all in my house last year to keep up to date.  Modem is also plugged into same PowerStrip that is used to also connect my Landline Phone Lines and Internet that I also have via AT&T.  I have also switched the TV to different "plug-in" on the power strip to test as well.