RG-6 is simply better shielded than RG-59. There could also be a crimp problem somewhere causing a fubar on his side. I friend of mine only had a problem with his when he plugged in his christmas tree. It was finally traced to the attic, where squirrels had eaten through the shielding on part of the cable. On another note, the cable companies around here use exclisively RG-6, since it is only marginally more expensive and it has far less problems. It only takes one unnecessary trip to eat up the difference. It's usually end-users that buy RG-59 because it's cheaper.