Video signal intermittently goes black but has sound. - DirecTV DVR

#1
For DirecTV TV services which include DVRs and receivers, Video signal intermittently goes black but has sound. My DVR loses the video signal hit the sound remains. It loses it for just about 1-2 secs. I thought it might be overheating, but I have a fan directly on the box and the problem is still occuring. Any suggestions? Replace the box?
 
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