Packet Loss after PC Move

I run my rig off of Ethernet and until Sunday, it was located about 10 feet away from my switches / modem / router.

Now, my rig is about 50feet away and I wired it in with a new cat 6 cord (previously the working version was a patch cable I built) from Amazon - one of the flat style cat 6, rather than traditional round style.

Now, I am experiencing packet loss warnings immediately as well as the slow responsiveness in my peripherals. The spotter threatens to throw me out of the test session. Effectively, I cannot race.

I went through iRacing self help steps: update GPU driver, directx report, etc. my fiber internet tests at about 250mbps up/down, etc.

Any advice or experience fixing this? Feel the need to 🏎️