I have a Dahua NVR5215-16P-4KS2E that has been working flawless since 2018. I have a monitor hooked up by HDMI with several 9 cameras in the split screens. I happened just to click into one of the cameras and then clicked back out to view all the screens again, and not it says "decode not enable". I didn't make any configuration changes, HD are fine, fans are running, I can view all the cameras/playback just fine in the web browser. Seems it's not wanting to display images by HDMI all of a sudden, why is that?