OK so what happens if you have the screensaver set to some visible screensaver, and the time to screensaver set to a large number?
Have you definitely determined that you are not going into sleep mode? Have you determined that this is timer operated ie exactly the same elapsed time with each episode?
There are also settings in the BIOS, motherboard drivers, motherboard makers supplied utility applications, graphics adapter drivers and display drivers that can be applying power saving features. So what motherboard, what display etc. etc.? An installation of Windows 10 might well have replaced or hosed some of those, or it might be set to interact differently with your BIOS features or graphics adapter than your previous OS.