Been using router for 6 months or so, plugged into my RT68U Asus router by Ethernet.  Works fine until I bought this simple TP-Link switch.  Now with Arris cable modem hooked up to switch and out to both routers, the Asus works fine but the AX3000 will not connect no matter what I try.  However all I have to do is remove the cable from the switch and plug it back into the Asus Ethernet out and it comes right back up almost instantly. -SMH

I've tried different cables, ports, power cycling all devices together and anything I can think of.