Every time I get close to gold i go on a massive loss streak

Okay so today I was S1 80lp everything was going great but then i played bad a in a few games, but the ones with vel koz i played today I roamed helped out and tried everything i could but top and jgl cost the whole match. Every time I am close to gold I loss legit lose all my matches until I am silver 4 70lp, and then I'll win them all get back in s1, go close to gold then it will repeat all over again, it's so annoying what's up with this match making?
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