Samsung reboots daily, but 'uptime' says otherwise

I'm pretty sure my Samsung Galaxy A20 reboots daily, at around the same time, showing the usual signs of a reboot: sounds some kind of notification it's rebooted, takes a few seconds to find the SIM and reload the weather widget, asks for the password instead of a fingerprint to log in ("after a reboot"). However, Settings/About Phone/Status/Uptime says it's been up for weeks. What's going on with it? Is it just reloading part of the OS? Is this normal? Why is it rebooting daily?