The shower control is a single handle type, moves up and down for volume, and left and right for temperature. After I pull the tub spout diverter to use the shower, I hear a lot of air coming out of the shower head with the water for a while. After 30-45 seconds or so it goes away, so it doesn't seem like a pipe leak causing a venturi effect. I don't remember experiencing this on any other shower. Does it sound like a problem? Thanks.