No Keys for about 2 weeks (67 wins)

So i don't normally have a problem with receiving and farming keys ...... I usually receive 3 keys every 15 wins or something like this ...... But for about 15 days i haven't received even 1 ! I am not banned or something . I know that it is a curved system and that every key i get , the other one will be harder to receive but the last key i got was pretty easy to get . I am just being patient but it is becoming ridiculous ...... Btw when i say Keys i mean Key fragments *Sorry for my poor english . English isn't my native language ! Thanks for your time !