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It's the second time this bug occurs to me : after looting the initial golden box, I don't get anymore purple ones ( after the 5 minutes or so timer ). I already tried ( although not extensively ) switching loot sources, character, but right now it seems the bug is persisting through this.
Can't really say what is causing it, in the same conditions I think I still get more boxes other days. I was at the limit for tickets and could'nt drop them initially, but it was the same thing a few day before; I had a purple box in my bags, but yesterday it doesn't prevent me for getting more; I may have killed a boss before the 5 minutes timer, but if it was causing a lasting bug I guess we would have heared from it.