Anytime the air gap window (tiny hole on the faucet) is leaking it’s because of the 3/8” white tube connected to the drain line which is gravity-fed and needs to be on a vertical slope with no extra length. This is the only line that does not require pressure to push the water so that’s why it needs to be as short and straight as possible. If you have had your system for over 4 months we suggest you clean your drain line. Watch this video for reference.