Why are my ranked games lately almost all games where my team is significantly lower rated?

I've been dropping pretty hard in ranked the last few days, it happens sometimes. I didn't think much of it at first.

I finally went and looked through my match history though and I've been getting a HUGE margin of games where my team is at a significant disadvantage in team rank from the opposing team.

My last several games

1. My team - G4, S2, G4, G4, S2 Enemy team - P4, G4, G3, G3, G3

2. My team - G4, S1, S1, S1, G4 Enemy Team - G4, G4, G4, S2, G4

3. Actually even teams,

4. My Team - G3, G2, G4, G2, G4 Enemy Team - G4, P4, P4, P4, P4

5. My Team - G3, G2, G3, P4, G3 Enemy Team - G4, P4, G4, P4, G3

6. My Team - G3, G3, G3, S2, G4 Enemy Team - G4, G3, P4, P4, G3

And so on.

Why am I getting so many games where the ranks are hard skewed in the enemy favor? Of course I'm going to be dropping rating like mad when my whole team is outclassed in every game.