So I have a 5s and I've noticed that little or no sound comes out of the left speaker. I almost never run music through the speakers and assumed that no sound was coming out when the phone rang because I had mono ring and text tones. If I cover the right speaker with my finger I get almost nothing, and what I do could just be leakage from the right speaker. I can't find a balance function anywhere in Settings. Is this normal? Does anybody else experience the same issue?