It appears that the over-the-air update to the UConnect system went out on Friday, and many, many owners have not had working center-stack systems since then. Many of these vehicles are nearly brand-new, which makes the issue even more maddening.
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The failure of the UConnect system isn’t just limited to not having a radio; like almost all modern automotive infotainment systems, the center screen, controlled by UConnect, handles things like rear-view camera systems, navigation, cell phone connection systems like Apple CarPlay or Android Auto, some climate control functions, many system and user settings, and more.

Source: Fiat Chrysler Pushed A UConnect Update That Causes Constant Reboots With No Announced Fix

Ouch