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last -x shutdownlast rebootshowed me that I had a new kernel version every time after the sudden reboot. This led me to look atUnattended-Upgradein/etc/apt/apt.conf.d/50unattended-upgradesand/etc/apt/apt.conf.d/99custom-unattended-upgrades. See my answer here for more details: askubuntu.com/a/1261057/119592