Um, coincidence?

I don't think that there are hundreds or thousands of computers involved in an attack on you (ruling our DDoS) and I don't think anyone with the knowledge to do such a thing (DoS) would risk federal prison to win a match against one team in a game, I have to say. Who is your ISP?

Nobody could be attacking you with a DoS attack and remain online with the same, or attached IPs (so, not in the same house).

I'd say, you got bad timing, and your ISP was taking a dump. it happens