I‘ve noticed that very occasionally I get a slow drip through the tundish and out through the overflow, only when the hot water is running. It drips about once every 10 mins or so and the water feels cold. It doesn’t drip every time the hot water is running but as I said above occasionally. The mains combivalve was changed in July during a service for a like for like valve because it had developed a leak. Does this indicate a problem I should seek help with ? Thanks.