Plugging in etheet cable slows down wireless

I have a D2200D DSL router provided by Frontier. The router connection has been failing with the DSL link light solid green, Inteet link light blue. Failures show up as computer wired and wireless adapters showing "No Inteet" and browsers failing with DNS failures. Failures occur every 10 min to about 1.5 hours.

To diagnose, I unplugged all devices from the D2200D and used ONLY the wireless connection. No failures for 36 hrs. Inteet speed steady between 1.5 - 3 Mb/s (pretty much the max of my DSL connection).

I then added an Asus wireless router (high-end), and plugged it in to one of the D2200D Etheet ports. Checking my wireless speed, it was now down to .5 - .8 Mb/s AND the latency went up from about 40ms to 170ms. Ran test several times with similar results.

I then unplugged the Asus device, re-ran the test and speed was back up to the nominal range. NOTE: No devices were plugged in to the Asus router either with a cable or wirelessly!

I then plugged in my Etheet over power ActionTech device to the D2200D, and, without plugging in any other devices to any of the ActionTech remote ports, re-ran the test. Again, wireless speed (from the D2200d) was down to the .5 - .8 Mb/s and latency was back up.

Unplugging the ActionTech retued wireless performance back to nominal.

Why would plugging in Etheet from a 2nd device, when that 2nd device has no other devices attached and thus no Inteet traffic, cause the D2200D wireless performance to drastically fall? Since I used two completely different test units (Asus and ActionTech), I am not seeing the common cause for this.

And, I should add that the D2200D DSL router has been replaced three times with no change in the results.

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