When it happens it's usually for around an hour, seems to be around mid evening usually, but have seen it randomly all times.
It's packet loss, ping to the na west is normally 130~160 in game but during this time the connection light flashes green and red for the whole round and the ping jumps up around 100ms (250~350). It's not so much the ping that's the problem but the packet loss as it rubber bands, jerks, and lags.
Running tracert between a good time and a bad time shows crazy bad packet loss, and yet, my friend on slingshot is unaffected.