Sporadic snowy picture - DirecTV DVR

For Sporadic snowy picture, relating to DirecTV DVRs and receivers. I bought a Samsung 32" LCD TV and hooked up all the connections. The picture was perfect for several days. However, the picture gets snowy sporadically. When I unplug the receiver and let it stand for approx. 30 seconds then plug it back in, the picture is normal again. Should I get another receiver? Thanks.
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