Unfortunately - same thing happened to me while ago. Staying online and two guys at the same time (!!!) attacked me with 2 x 4860 diamonds lost... ***?!!
Restarted game and 125 for finding target. Looks fine. Then fight, my final killing shot at PVP against Limon, game freezes, I restart it and what do I see? ATTACK LOST...
Thought the same it's rather hard. :) After 10 minutes moving and looking around when nothing happened, after 100 shots made even to train on the bridge... I gave up