I get a network broadcast storm with Yosemite

I had poor internet speed and loss of packets.
BT and AAISP could not fault the external line.
It emerged the problem happens only when I use both  wifi and wired ethernet (or indeed wifi only) on my Yosemite Macbook Pro.
AAISP said it was likely a 'broadcast storm'.
This problem has not happened, or was not significant,  with previous OS X.
I am using WPA/WPA2 Personal to a Technicolor TG582N router.

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