At seemingly random intervals computer screens go black momentarily while audio stays on. It happens on my Chromebook, ThinkPad T480, Asus HB1M-Plus as well as our Samsung 55" smart TV. I think it only happens during YouTube videos, regular broadcast cable shows and Netflix streaming. Operating system are Chrome, Windows 10 Pro and Windows 10 Home. The Xfinity router is a "Dual-Band WiFi 802.11ac XB3" The PCs are cabled to the modem, the Chrome book and Samsung TV are connected by Wifi. I would say it has been happening for the past year but the blackouts seem more frequent now. The blackouts may last for 1 or 2 seconds. I am not positive but I think it happens individually, and not all screens at once.
Is anyone familiar with this phenomenon? Cause? Is it Comcast" modem (my best guess) or the Comcast/Xfinity network? If not, any ideas how to test or or eliminate causes?
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