key fragments not dropping

i know the key fragments are supposed to become rarer and rarer as you find them, but i have not found a single key FRAGMENT in the last 2 weeks now, despite playing multiple games every day. Pretty sure its bugged, as everyone i play with is getting key fragments and they play just as much as I do, so they shouldnt be getting key fragments more often than me. Not to mention, 2 weeks without a single fragment seems a little harsh, seeing as Ive only gotten 3 fragments in May, and its now June. Would really like to hear an explanation as to why I cannot find key fragments but my friends who have found more continue to find them on a regular basis but I do not.