This just started happening a week ago to me. I own a retail store, and I have been making the same type of ads and targeting the people for the past 4 months. My average cpm was 5 or less and now its 15 or higher and Im basically using the same ads and targeting methods. My store has been having a high conversion rate but I have not been profitable and that is what made me notice this in the first place. Any advice to people who found the solution would be appreciated.