U Verse--- Set top boxes or Gateway?
Ethernet wired from outside phone box to Gateway then to each set top box. Both TV's go black, pixelate, no sound or voice. This happens on more than one channel. I have used Troubleshoot/Resolve. Shut off power to Gateway and set top boxes, pressed resets. This will clear up problems for a short time then back to the same problems. One TV has more instances then the other. AT&T last year sent a replacement Gateway OK for a while. We had a technician in the past replace set top boxes. Still these problems may start in one day or one week.
WiFi is Download 4-8Mbps depending on the room. House is 1900 sq ft. Signed up Internet for 8Mbps. Furthest Smart TV loses WiFi and buffers a lot. Gateway is about 30 ft away from last TV. Phones can only reach 1-2 bars for signal strength inside. Phones get drop Smart TV can't connect to Internet.
Need some ideas or AT&T service?