Once you hit 30 wins in competitive, it seems that the game locks you to your current rank, or pushes you downward. I've noticed this pattern across multiple accounts that I have... so it isn't relating to a factor such as the hidden MMR o...

It seemed to be going well until I got a +10 out of the blue, my combat score remains about the same but yeah I was two negative... doesn't feel as though that should remove 12. Then there's a loss and it's -29... a bit disproportional....