Admob Ecpm question

So I have been using Admob for almost 2 years now and today I experienced something strange. The interstitial Ecpm for an app I have had a massive drop, while the banner Ecpm remained the same .17. In the past the interstitial has always been between .80-1.50 Ecpm, but today it was at an all time low of .40, of course I was very surprised, especially given that yesterday the Ecpm was around 1.30. Most of the traffic is from India, US, France, Mexico if that helps. Any advice or similar experiences from the community would be greatly appreciated. Thanks guys

same here, last day and today my earning drop down about 150% today I send message to Admob team don’t what will response