Why would my speaker on my iPhone start cracking an I can barely hear who I'm taking too?

I have an iPhone 5s an my speaker while talking to someone is all of a sudden started cracking an the person talking I can barely hear. The phone hasn't been around water or anything like that An I have only had it for two weeks. What could cause this?

Get out your warranty

IPhone are the cheapest pos to come out if the foxconn

Bad connection. Next time End call that call back.

Your phone has aids