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I have a WPA4220 Kit and three PA4010 extenders.but the connections (mainly ethernet cable) from the TP LInks crash many times a day. My primary internet connection does not do this - I have tested it over 48 hours and it did not crash at all. If I make a PC "ping" the ethernet gateway once a minute, it reduces, but does not eliminate the problem. This system replaced an AV200 system (I needed an extra outlet and couldn't get a 200 model), and I did not have this problem with that, so I can't see that it can be a problem with the electrical wiring in the house. There are no heavy duty electrical items in the house.

Any suggestions very welcome. Thanks.