I am not sure if my comment will help, but one thing I noticed after this Fall Creators was that uploading to Google Drive (or Youtube) seems to be limited to 230 KB/s when my broadband is 50 Mbps and 5 Mbps for upload, meaning the max UL speed is 700 KB/s. This always happens when I restart Windows. However I discovered that if I disable and reenable the network adapter the UL speed is back to normal. Not sure why.We're looking into this. It likely has something to do with the Creators Update.
I have also updated all my Windows drivers, and the Apple TV 4 uses a fixed IP in my Archer C8 router, like my PC and iPADs. The ATV uses the IP 192.168.8.149 (permanent, it doesn't change when I restart the modem). I use the H97M-D3H motherboard, and...
https://imgur.com/a/cQ5Ax
Hope that helps... it's really unfortunate that it stopped working especially in the ATV because the VLC app (which can access my Windows folders right now) is not an alternative for me.