Demoted after only two games

Hello my dear riot employees. Three days ago I was promoted from silver 5 to silver 4. Once I turned silver 4 I decided to play a few more ranked games which I won and lost some in the process. After about two days of playing ranked I had 0 LP at silver 4. Yesterday I played a ranked solo duo and lost while I was still at 0 LP and today I also played one and lost and was demoted. I personally think that it is unfair that the ranked system does not warn you when you may be demoted. If I had a warning I wouldn't have played a ranked game. I strongly hope you will look at the post and consider changing the rank system so that it will give warnings for ever time you may be possibly demoted. I thank you for reading this post and I hope you consider changing the system.