Everyone helping killer?

So i have been playing dbd for several months now and suddenly last night when i reached level 11 (could be total coincidence) almost every game I have played, 1 of the survivors helps the killer to kill the rest of us by pointing us out, body blocking so you cant escape the killer, unhooking right next to killer over amd over, etc. Ive never experienced this before up until now. Probably 7 out of 10 games this is happening. Its very frustrating. Is anyone doing anything about this. Doesnt seem like reporting has any consequences...