Key Fragments?

I've been playing games for a week now, and regardless of solo, duo, or trio queue, I haven't gotten a single key fragment from any of my won matches. My friend can solo or duo queue and he gets a fragment guaranteed once every 5 wins. I get 1 out of an entire weeks worth of games(since I can't remember exact number of won matches). My question is, is anyone else having horrible RNG for these things? Because it seems really broken that some people can solo queue and get them, and others like myself can have a party and get nothing after 20+ matches. Also, is key fragments reserved for only normal/draft pick games?
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