Catastrophic drop in ad impressions?

I had a drop to 0 on one of my channels as well. The weird part is that it was on one of my more popular games, Snake. So the game with more requests was getting 0 fill and other games with less requests were getting fill, low fill but still something.

I'm not sure what it was all about, I personally ended up transitioning to 3rd party ads. Hope things get better for you.