After updating for 12.23, some upcoming race/event added on Garmin Calendar (I think that it is the one set as primary race) appears with 4/5 bullet points/screens (depending on whether you have course added or not) to navigate.
Usually it has 3/4 screens: Information of event, Time prediction, Temperature and Course.
The problem is that navigating to fourth screen (when it has 5) make the device reboot.