New Netgear Nighthawk R6700v3 . Multiple cables - all good but Pioneer VSX-70 audio system won't connect. Worked fine with old router. Loopback shows all ok, but still nothing. Multiple unplugging power cables from modem, router and audio system, starts and restarts, etc. but still no sign that the 2 can find each other. Audio system shows set up correctly onscreen etc. as well. Ideas?