When the temperature drop in low 40s the front will drop down
Do you know if you have air suspension in the front?
This should have air suspension and it could be that at 15 years of age a leak has developed around the air strut boots in the front. Just like tires and belts, air suspension rubber degrades over time and leads to dry rot.
I have no affiliation with the company but you might try American Air Suspension for further advice and any replacement parts. That’s all they do;air rides. I believe (not sure) they may have a rental diagnostic tool available to read air ride codes and so on. Pricey I’m sure.