@Elee This solved the inconsistent download speed issue: "go to Advanced->System tools->System parameters to modify the negotiation speed from "Auto" to the "1000 Mbps full"? The negotiation rate...

@Sevi I've spent so much time on the phone with TP link diagnosing this router, and the slow speeds always seem to return. No wonder this AX3000 router is cheap to purchase. Not worth the time spent...