Why is it that when you stop playing league than comeback you feel like a bronze 5 player?

I stopped playing league for a week I picked up skyrim and played that instead then I come back thinking 'time to grind to gold 5' first game get a team of people yelling at me and force me to go supp my adc was a bronze 5 (im silver 4) I could deal with this but when the game started I got rapped not jokeing went 0-9 I thought 'mmkay 1 in a million' I try going try hard next game get rekt again and again and again just played my first 2 ranked games got rekt in both doing a duo strat that has never failed me in ranked. Previous to this week I was what felt like on top of LoL I was dropping pentakills and winning tons of games does league have a mind of its own and riot just has a karma system in place to give you a hard time when you dont play there game? or did i just have bad luck this week? sigh idk I think I gave up on ranked for this season morgana isnt even a fun champ....