The last time I brewed, I used a "new" burner that I had just bought. My session was going fine, burner was putting out decent heat, then suddenly the flame noise changed. I turned around, and the flame had made it out the air intake and had a secondary fire going. Being a crafty home brewer, I thought perhaps it was getting too much airflow. I waited for it to cool, then I put some foil over half the intake. This worked well for a while, so I went in the house to grab a bite (or drink). When I came back out, the flame had come out the backside again and was melting the hose. First, what would cause this to happen, and how can I avoid it in the future? Next, is there a vendor that sells replacement hoses?