Hi.
I was experiencing this issue for years, three or four times I guess, practically since SW 2015 was released. I tried everything and only reinstalling Windows was the solution, but now, after an "origin update" using a totally new rig, ISP, router, etc; happened again. Origin connects, I am online, but no game from my library is capable to connect. I didn't wanted to face all this issues again, less to ask support to Origin, so I leave it and started to play games only from Steam, Uplay, Epic, etc. Even I bought SW SQUADRONS from steam.
But wait; here comes the unthinkable... I was testing the way my Microsoft One Drive account works when no network devices exists, so I uninstalled It from Device Manager. Then I reinstalled It again, of course after finishing the tests. It is funny, but just by pure luck I opened Origin and started SW Battlefront. It loaded very fast, everything was normal and working properly, with fonts text and all data. Immediately I went to my old computer, only to verify that there may be the solution I tried there and the issue was the same, no fonts no connection, slow loading. I uninstalled and reinstalled the network devices in my old rig, as I did before in my current rig. And there I was, all my games working fine in all the devices.
I hope this could help to somebody else, not only in SW Battlefront, but in any other Origin game.