sato Hey there, hope you're doing well today. 🙂
We don't have data for Sunday yet, so don't panic at the fact that it's showing $0 EPMV, this will update later today.
Regarding the EPMV drop on the days prior, I've compared Aug 3 - Aug 5 with the three day period prior and it does look like I'm seeing a lot of changes with regards to traffic demographics for that period. I'm seeing a 45% decrease in Engaged Pageviews / Visits for these three days and a 274% increase in Bounce Rate; which would definitely contribute to this reduction in EPMV. It may be worth checking to see if anything on your site (whether it be content or technical) has caused this shift.
In the "Traffic Sources" section of our analytics, I'm also seeing that traffic directly to your domain was 28% of your traffic for the earlier, higher EPMV period but 59% of your traffic for the more recent, low EPMV period. This would suggest a shift in the audience that your site is attracting and a potential change in behaviour there; which likely links into the first point.
-Lilla