Not an expert by any means, however, I’ll add my two cents. As mentioned above, the valve has a component that acts kind of like a hot water heater relief valve. If the pressure inside the tank get too high, the valve will vent (even if turned off) until the internal tank pressure gets below the level the relief valve wants. I have been told that’s why the stores that sell replacement tanks, like for barbecues, etc have signs on the door to keep them all outside. The temperature of the tank will affect the gas pressure inside the tank, hotter outside, higher pressure inside, valve may vent, you’ll smell it. I park my coach where the evening sun heats the door to my tank, I’ve never measured it, but I bet the tank gets warm. Good luck.