Badly Fluctuating Upload Speeds

Ok so I have a Netgear Nighthawk C7000-100nas Modem/Gateway. As of about early June, my 2 Xbox One X consoles cannot play together on the same network, due to an unstable Upload speed that the Xboxes both report. They are both hardwired. My One X is a part of the Alpha push-ahead ring but problem is present in non-preview consoles as well.

I typically get 250 down/20 up for my speeds, but as of early June it fluctucates back and forth between 1mbps upload and 25. Its so drastic and sudden (constantly this big change in reported speeds) that when my girlfriend and i play together we just rubberband and get disconnected from servers constantly. We havent gamed together in over a month and its frustrating. My PC doesnt experience this issue at all and always reports about 250down/20-25up.

Ive tried the following:

-Power Cycling all devices on the network

-Factory resetting all devices (including gateway)

-Port Forward with Static IPs

-DMZ an X1X on Static IP

-Swapped ports on gateway

-Swapped PC Ethernet (the has no problem) to Xbox One X and issue persists

-Cleared Alternate MAC address on console

-Tried WiFi instead of Ethernet, to no avail

-ISP(Mediacom) says ports needed are open

-ISP checked all lines and cables

-ISP replaced all lines and splitters to the dropline

-ISP checked SNR and Power levels (they are ok)

-ISP tried one of their modems and issue persists

-ISP removed and re-configured my gateway on their end

-Gateway shows minimal to 0 correctable/uncorrectable errors

-Disabled ipv4/ipv6 firewall settings to test

-Tested OG/S models on public firmwares

-Lagging happens on every game, not just one

Things I HAVENT been able to try yet:

-test speeds at another location (need higher speeds to test on as people i know dont use high upload)

-Switching Cat 5e cables for Cat 6

Im Im honestly at a loss. I doubt many people have 2 Xbox One X consoles on the same network playing together, but Im really starting to wonder if there was an update at the beginning half of June thats causing this problem. Me and my ISP are literally at our last steps and cannot figure this out at all. Its stressful because we played together a lot and now we cant in any capacity..... As of last night my console alone started lagging so badly as the only one playing that I couldn't even enjoy the game I was playing. Help?

submitted by /u/Co2_Outbr3ak
[link] [comments]