been having this issue on and off for 6 months. Tv will turn on and after 10 minutes or so the picture will cut in and out. Sometimes reboot helps sometimes not. Auto updates are on and smart rv is connected to the wifi. We have gotten new boxes and cables. Nothing fixes it permanently. Touching the cables appears to make it cut in and out too. This is on a small box on a second set not the dvr. We pay alot for cable and this is really aggravating
does the audio stay 'on'? check the cables by pulling out of the HDMI socket and press back in and 'feel/hear' the click as it locks firmly into place. do that for each end of the cable.