I am experiencing the same.
If you go to your EA account, there in security and privacy, you can download account info. In there, it actually tells you your ban - EA isn't reporting it, which makes me think all of us that are suddenly experiencing this are suffering from the same bug in their AC. My ban reason was "account_abuse" which makes zero sense. The only thing new that I did was in-game link my discord account. I only use my steam account that I have my EA account linked to on one pc, I never have inappropriate names, I do not grief or abuse anything...it's ridiculous and I hope they get this sorted ASAP. It's very disappointing and I suspect it's whatever this new AC is messing up with the influx of so many players.