I saw a similar collapse a few days ago. It seemed like overnight my CPC’s and CPM’s doubled, and my ROAS went down the drain. I was devastated the last few days. I tried relaunching all sorts of new campaigns with new creative, old creative, new audiences, old audiences, everything. Nothing was working. Then today suddenly things just started working again and performance seems to be steady. So weird…it was as if my account was broken for 5 days then went back to normal…