Stop surrendering when you're behind.
Just played a game where we were 10-21 kills behind and 2-3 towers. Now this may look bad but we were ahead in CS and we were still trading evenly or even better because the enemy plays greedily. My team decided it was time to surrender and I voted no but my other 4 teammates all voted yes.
Why play this game when you're going to surrender at 20mins when you're behind?
ps: if you're 2 inhibs down + baron + 10-50 in kills then yea you can safely surrender but this game wasn't over by a long shot.