video goes out but audio works

while watching direct tv the video goes out and the audio works. This occurs after watching for about an hour. Direct tv is connected to receiver with HDMI and then HDMI is run from receiver to the TV. I had direct tv install new box but it still happens. I switched out the HDMI cord from direct tv to receiver and it still happens. The Denon receiver is 7 years old. Seems like its the receiver?

It should be noted i have apple tv hooked directly to the TV and I have no problems with video.

thx

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