If you haven't done so, open an SR with EMC. I had the same thing happen in April. Support got on a WebEx with me to run a backfill report for the missing days. From what I could tell, the data I normally expected was there.
One thing to note is that historic data collection (backfill) can be challenging when a large amount of data is being generated. In my case, we had to do a manual backfill for the first 2-3 days, then the second group of 2-3 days, until we finally collected all the data from the seven days I was lacking.
Let us know if that helps!