on 11th april 2016 at around 13:20 gmt everyone from server 302 disconnected, when we came back the evil spirits attack event we were doing had reset to 0 damage and we had to start it over again, we were 95% complete at the time of the DC. what the hell happened?? a server crash, a reset?
it looks like a small server problem occured, but nothing bad as long as you could re-enter the event... double silver & exp for all
once on our server we had a reset of Ryokas: around wave 45, we suddenly went back to wave 1... much more kills and rewards! (unfortunately it never happened again )