Dis you know that Naughtydog randomly gives you losses on the leaderboard. How did I find this out you ask? Well, I played on an Alt account for kicks and trolling. Here are my real stats (and I remember every match cause I've only played 36 games on it):
I noticed it right when my stats first appeared on the leaderboard and I had two losses. Then I played and won a few more game and I magically got 3. Then the 4th after my last match. I won every match leading up to my "4th loss".
You can say what you want, but I won't believe you went 36-1 without a party. Even if you're very good at the game and do something else than team killing people who are 5 seconds afk because they use text chat noob teammates will make you lose 5 timed at the very least.