Water was my first thought also. I grew up on a farm with butane for cooking, heating, etc. We ALWAYS turned everything gas off at night when it was getting close to freezing outside. Water condensation in the pipes was not uncommon and resulted in the flow of gas being interrupted. At that time, none of our gas heaters/stoves, had auto shutoffs or auto igniters, so if the water in the line froze and blocked the flow of gas, when it defrosted you had raw gas coming out of the heaters which would be lethal.
Although we have come a long way in technology, moisture in the LP system still occurs and will cause exactly the problem you are experiencing.
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