My brother has had a DSR 505 for about 3 months and since the begining it has had a weird problem, while watching a HD channel it would have picture interferance if the washing machine was started . It was only the washer but now it seems to be anything electrical that comes on for only a short period of time. One other thing is it only happens with HD channels not SD.
Maybe have him check to see if the 505 wall outlet is grounded.
Some power pars have a grounded light so you could try plugging one of those into the outlet to check.
I'm not an electrician but that might explain the interference.
Had that problem once video pixelated when I tured on the washer or anything with a motor a tech guy said I was using the wrong gage cable and there was signal leakage I replaced it and it stopped, you might want to look at your connections at the back of your box.
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