There was a drop.
May 14 2015 39,268 -5.30% 1,124 GH/s
May 10 2015 41,466 6.91% 1,187 GH/s
Dyask I told you some pages before that the power outage was on
MAY 11, so you date is incorrect and don't coincide with the incident, so you are't proving anyting !!!
For reference
PAGE 80 OF THIS THREAD