DDoS attacks even on consoles are extremely rare, it is more likely based on your description that there is a connection issue between you and the game server. Please note, it does not matter how fast of a connection your Internet Service Provider has, as you could be experiencing hardware issues within your home or there is a problem with reaching the game server beyond your Internet Service Provider.
First please take time to ensure there are no problems on your end, by working through these console specific troubleshooting steps. This especially includes making sure your console is connected by ethernet to your modem/router (a common problem with most console players is by trying to play over a WiFi connection).
If you need more help after working through these steps we can try to provide advanced troubleshooting to at least pinpoint the problem. In any case, please avoid playing Competitive Play until you can assure the disconnections have stopped. Penalties cannot be reversed.