New Ranked season / demoted from plat 4 to bronz 1

at end of season i was plat 4 both solo\duo and flex , in solo i lost 7 of 10 and gold 3- its ok i understand all ( np all afk team's ) but why in flex i won game and was platinum/ lost 2 and **now im bronz 1 why ? ** any help ? how much u can lose ? its fair ? to lose 2 games and lose so much divisions ?
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