Bad luck or end of season?Coincidence?

No matter how I try,suddenly from the last week,I got GAINT LOSE STRIKE,fell to play 3 75 LP from play 1 50LP. Anyone out there for the same situation? I mean,nobody is perfect,sometimes I feed,but I still keep my CS high as possible From my expirience,most games decided at Bot lane,if their adc gets fed,your tanks and bruisers can't 1v1 them,and you lose. I wonder what will happen when the preseason enters live ._. Seriously I wanted so much to get to diamond before the season ends,but it's not gonna happen and I just can't deal with it... Anyway back to the point,it seems to me last few days matchmaking is REALLY unbalanced,and even though it's the last few days,people seem to give up more often,creating negative expirience. Plus I just can't deal with This retarded champion so safe with her gigantic range,HUGE point and click knockback,while having a LARGE leap...I feel that unless you have point and click CC like Taric,Naut/point and click bruisers like Vi,Lmaokai there is no counterplay to her safety. Back to my original question,Do you guys also have sudden loss strike?feeling like matchmaking is worse than ever?