Recently we have developed an interesting quirk - when you turn on the kitchen faucet, water leaks out of the spray head on the hose sprayer. Any ideas why this would be happening? Thanks

You have got some crud up in the head that's preventing it from shutting off completely. You have two options. You can take the spray head apart and clean it or ,since they are so cheap, just purchase a new one and attach it to the hose. Good luck, Tom