Perhaps it's a home router issue. Have you tried enabling Universal Plug and Play (UPnP) if the router has that option?
Or giving the gaming PC a static IP address in router settings and assigning the static IP to the Demilitarized Zone (DMZ) if the router has that option?
I wouldn't keep the gaming PC in DMZ since the router's firewall will no longer be protecting it, but I'd try it for testing purposes to see if it stops Battlefield from disconnecting.
An even simpler test would be connecting the gaming PC directly to the internet modem. This will only work if the router and internet modem are two separate devices. Then reboot the internet modem.
What is ATT you mentioned in your original post?
I have tried ethernet connection - but it is a router / modem combo ATT is my ISP - AT&T - i have also tried UPNP - i tried a hotspot too so that is a totally different connection. this leads me to believe that it is more of a system issue rather than internet
