Solo Queue, win 7 games in a row. Soon as I decide to play some games with a friend: 2 losses with humiliating scores on my end. Yaaay. I will never understand why I turn into utter shit when playing with people I know. ;~;
Could be a major rating/MMR difference you weren't aware of. I have 4 and 5k friends that I stack with on occasion and something similar tends to happen.