Being a lifetime HVAC guy in a region with lots of cold and LP, I would bet the culprit may be the regulator though it's impossible to confirm that from here.
What can happen with an LP regulator in really cold temps is that the regulator body is typically aluminum and the stem on the diaphragm inside is bronze. Two dis-similar metals contract at different rates...and you end up with a sticky regulator over time. (Regulator actuation can compound this issue). That would also explain why a little sun shine may have freed things up.
In either case...good luck and stay warm. They are forecasting -11° tonight for us. Uff da.
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