Variation of refresh frequency of HDMI output

NGV

Member
We are experimenting with connecting the HDMI output into a TV modulator. The modulator loses the input rather too frequently. It seems to lose the input more frequently when the video display has no movement; e.g., is displaying a static image. If the display is showing a moving image, e.g., a Youtube video, then the modulator will less frequently lose the input.
We believe this is related to the video hardware or firmware changing or varying the refresh frequency. Is this possible?
 
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