Demotion

Ok so i was just playing some ranked... i had 3 LP lost went to 0LP... ok no problem.. played another ranked game right after it lost and got insta demoted.. lol.. Like WTF... rito cant cut someone some slack when at 0 LP for a few game?? just demote for 1 lose at 0LP?? I'll say this time and time again.. How come they cant add a demotion series... you get to 0LP.. a notice pops up and says you have been placed into a demotion series... Failure to win series will result in your demotion to the lower tier... that way there is no guessing games on when you could be demoted.. last season i sat at 0LP for about a 5 game losing streak and no demotion... this season is a 1 game and the boot... id love for some light to be shed on it.. thanks for your input..