C5400 not giving Gigabit Speeds
I've been trying to fix it for 2 months to no avail. I can not get Gigabit on hardwired connection. I have gotten Wifi up to ~700Mb which is more than enough.
I know the modem is passing through gigabit. I have tried balancing out the QOS, I have tried enabling NAT Boost (Which 'should' disable QOS) but still the issue is showing.
When I run a Speedtest it will either start at 100, and build up to ~400 then 'finish'. Or it will start at 500 and drop until it reaches 200 then 'finish'.
Is there anything else I can try, or disable? I have reached out to support but I received a person who genuinely didn't want to help and just offered to RMA it - I never received an RMA notice or the new router.