I looked in my Service Manual (not Owner's Manual), and I didn't see any reference to sunroof drains. But there have to be drains, to drain off rainwater in the sunroof channels so it doesn't freeze or cause corrosion.It was raining yesterday, no snow and in the morning was very cold
If so, I would suspect maybe your drains got clogged up, preventing the rain water from draining down before it froze. They shouldn't be clogged with a vehicle this new. Do you park outside, under trees?
Maybe something to look into after your trip...