This is happened to me 3 times already. I go to solo a battle (for example let's say it's Regina), kill the boss, and get no loot. There is no battle completion logo after or anything. It just plays through the usual random screenshots sequence and then... nothing. I could wait out the entire battle timer shown on the top right and it will still not give me my rewards. Might have been an unstable connection to the battle since my net has weird spikes at the moment, but even then the game shouldn't be allowing me to do a battle just for nothing. I can leave the battle and the game would act as if the battle didn't even happen at all (even though it would consume my durability on my gear). Note, this rarely happens to me but it does happen like every few months or so.

Frustrating.