If you mean the drop between blocks 188k and 190k, that was bitladen taking ~2PiB offline.
The daily average network size (from my miner logfile) for the last week is
4.24366
4.68704
5.04738
4.45498
4.88276
4.369
4.18486
so there is no substantial change.
There was an error in the graph when v2 stoped, I think, but it corrected itself after 15 minutes or so.
So... With v2 down, can someone explain how rewards are calculated and what triggers payouts on ninja? What is the fee? Also, what is most profitable, using Blago's submitting everything or luxe's whichnsubmitts the best dl? No info on that.
Transparency, guys

edit
Thanks