IP ban. Not terribly bad. You can call your internet service provider to get it changed, unplug your modem overnight and it will reset or just wait patiently for a couple of days. Most ISPs use a rotating IP so that every couple of days (tends to be longer than that, I'm just assuming yours may have been similar for a while prior to this) the Specific IP that you are using will change slightly.
Regardless, 1 and 2 will be your best bets and you'll be able to happily play on Neo once again