What is true going on when u Internet is good (DDos) attacks
They calling DDos attack.
example: U are in Ranked, everything is fine on ur line farming and jungler. Next when the enemy going to gank ur line a messanger pop-up to ur screen (Attemting to Reconect) and will finish only when ur Death.
DDos Attack can be made by a a member on your team or the enemy team. Is Not Riot server or a bug.
This the prevention Guide then u most take.
https://support.riotgames.com/hc/en-us/articles/201751764-DDoS-Prevention-Guide