I have 1G/1G Verizon FIOS which has worked fine for several years with both an RT-AC68U and then an AC86U reaching 900+/900+ typically. I just installed an RT-AX86U with the latest firmware (45934) and my wired speeds are very inconsistent, 600-800up/200-500 down. If I plug the ONT directly into the computer I get 900/900. Also if I test with the speedtest app on the router itself I also get 900/900. I've gone back as far as firmware 42840 with the same results. Any ideas? My next step is to try another AX86U if I can find one locally.