I am sorry to hear you are having this issue. For this, there are a few steps I would recommend trying initially.
Be sure you have updated the watch SW to the latest version 18.16.
If you have any Connect IQ apps or watch faces installed, I would first recommend removing these. Then see if the rebooting is still occurring.
If you have not already, I would recommend completing a hard reset. For this, hold the Light button until the watch shuts off, as opposed to selecting power off. Then power this on again.
If the reboot is still occurring, I would recommend removing the stored files from the watch. This would include Activities, Courses, Workouts, Locations, and Remoted SW:
Connect the watch with a computer
Open the watch drive
Open the Garmin folder
Locate the above folders and delete the contents
Disconnect the watch from the computer
Powercycle the watch
If this issue continues, I would recommend contacting Garmin Product support.
