Same thing here, every time I win 10,100 or 1000 gems in the arena, either I only get half or no gems at all! I sit and wait for the timer to countdown to 0:00 so I can claim them and they vanish right in front of me at lease 50% of the damn time. It is frustrating as hell, as I patiently wait and watch. Just today, a loot of 10 gems and a loot of 100 gems vanished. What the hell do I have to do to get them when I win the arena battles, as sitting and waiting sure as hell doesn't seem to be doing it. Any help would be great.