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Mine was doing it, I opened it to the vent up position cleaned it off and reckoned it and it’s gone. I’m sssuming it needed to adjust and reseal in the cold weather.
My rear roof glass panel was rubbing/rattling against the rubber gasket. Sprayed some silicone spray around the outside perimeter, wiped off with a towel. Instant quiet.
Typo, I meant re-closed it lol. I just ran my hand down the two surfaces while it was open and that was enough to let it seal tight. My thinking is the cold shrinks the panel ever so slightly and it lets dust in between the gaskets. Once cleaned it re-aligns and is good to go.
Now I see why many folks don't want the moon roof. I think I might lean towards not getting it. Will lead to some foreseen problem along the way.