Hello! I have the TUF GAMING X570-PLUS, but no wifi. In the last couple of days, the ethernet speed has really slowed down. It went from ~19 MB/s peak in Steam downloads to 1.5 MB/s. I've checked all the cables and ensured the connections are proper, but it's still horribly slow. I made sure network drivers were up to date from RealTek and everything else I could think of.
Coming here is my last resort for figuring out what could be going on. For reference, my phone gets speeds of 386 Mbps according to Ookla's Speedtest and my PC hits 9.12 Mbps on the same test so it's not my internet, that's for sure.