Had same problem. I called the plumber who for $60 told me to call Delta. He said the line inside the kitchen faucet was deteriorating. The house is 13 months old. Called Delta faucets and they determined (on the phone) that the plumber was right. They are sending me a new hose. Now I need to have the plumber back out to install it. Yes, another $60 fee then pay him in 15 minute increments. I think this is ridiculous so am asking the plumber for a break in the cost to return.
