my luck

i always get 10-15 win streak, and then 1-2 days later i get 15 lose streak, why? 6 times now. dosent matter how many break i take between games hours days. ill always get this loses.

want proof? today i had afk yasuo, i asked to remake. all of my team said NO. he came back after 20 min, and started to try going 1v4 at lvl 3. and ending the game 0/8, after 20 min of afk,

just yestarday i went 25/1 on pyke. now i have losing streak again after winning 10 games. is it just bad luck /;?