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Join Date: Jan 2001
Location: upstate NY
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If they work at all, most power-line networking devices work fine. (They can't work unless the adapters are connected to the same phase of the incoming AC power -- most U.S. homes are supplied with 2 of the 3 power phases coming from the power company.) Of course, if you have something on the power circuit that generates a lot of noise (like a heavy-duty electrical motor turning on and off), that could cause problems.
It could be a problem caused by "valid" traffic your local network. Perhaps something is intermittently generating a lot of traffic and interfering with other network traffic. Audio and video transmissions have to be able to deliver a constant stream of data. Most other types of inter-computer data traffic don't care if there are dropouts. You don't notice them retrying.
You might consider using some free network monitor software like Wireshark to see what your network is doing.
Marantz SR7009 avr + MM9000 amp --> Atmos 7.1.4
Fronts=NHT 2.9+AC2, FH+TM=DefTech PM1000, LCR+TM amped