Need help with keys

i used to get a key every 4-5 games. but i didn't get a single key fragment in the past 3 weeks. i searched the boards and i saw something about a "refresh". what is that? i thought it might be something like i have a max amount of keys i can get in a month. but i didn't get a key in so much time i don't think it works. can someone explain it to me please? sorry for the bad english btw
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