Hi Jeremy,
I have a 2018 3950BR as well, and we've experienced issues with our heat-pump, too.
I'm bringing it in for service in a few weeks, and I wanted to see if you had any update?
Ours will apparently shut off when it gets below 40F or so below outside. If you reset the switch from "heat pump" to "off" and then back to "heat pump" it will fire up again. But the result is it stops working randomly at night and then you wake up cold.
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