Broken system

So i have 7.8k mmr in EU. The games were fine, if you play good you win if you play bad you lose. Suddenly, this friday, the games changed instantly. Impossible to play, griefers,feeders,2-3 carries on lane and just to remind you this is 7.5k-8k+ bracket in EU. I don't beleive in 50-50 the community talks about, but sometimes this happens. For a week or so i'll get impossible games. I mostly play all roles and this is mind exhaustion when I get these games. Literally the only normal person in these games is me. Now I wonder where do these players come from, how have I not seen them so far. Also just to mention I have 11500 behavior. So my point is if someone else also get these kind of games. I'm at loss of words of how to explain what kind of games these are and the fvckin mmr is almost 8k.
Just now i had pudge rank 2200 jungle with 4 mango 4 clarity and salve because he didnt get safe lane and Furion rank 1900 cliff jungling so I had to abandon to not lose the mind trying to play this kind of game.