I would suggest placing a plastic cup under the PVC pipe inside the overflow tray to see if the T&P (temperature and pressure) relief valve is tripping. The relief valve is designed to trip when the water temperature exceeds 210 degrees, or the pressure exceeds 150 psi. When it trips, it may only discharge a small amount of water, which you will see in the cup. If it is tripping, you probably need a new water heater and/or an expansion tank, or a new T&P valve. I would also fill the overflow tray with water to see if it has a leak.
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