Haven't gotten key fragments in over a month

Well like the title says, I havent gotten key fragments in over a month. It's not that big of a deal to me but I still like the randomness of opening the chests every now and then. Im just wondering if the drop rate of key fragments have been reduced or is this just some kind of glitch. I noticed it first time about 4 weeks ago, then i read somewhere that the drop rate resets every month so I thought i would start getting key fragments again in april, but so far no luck. Can anyone explain why i'm not getting any loot after games?
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