One point I found in common analyzing the logs is the forced reboot happens after the anacron jobs.
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Sep 14 08:00:33 motile systemd[1]: Starting Discard unused blocks on filesystems from /etc/fstab...
Sep 14 08:00:42 motile fstrim[2945]: /home: 162 GiB (173904515072 bytes) trimmed on /dev/nvme0n1p2
Sep 14 08:00:42 motile fstrim[2945]: /boot/efi: 43.4 MiB (45495296 bytes) trimmed on /dev/sda1
Sep 14 08:00:42 motile fstrim[2945]: /: 47.9 GiB (51415863296 bytes) trimmed on /dev/nvme0n1p1
Sep 14 08:00:42 motile systemd[1]: fstrim.service: Succeeded.
Sep 14 08:00:42 motile systemd[1]: Finished Discard unused blocks on filesystems from /etc/fstab.
Sep 14 08:03:58 motile rsyslogd[807]: [origin software="rsyslogd" swVersion="8.2008.0" x-pid="807" x-info="https://www.rsyslog.com"] rsyslogd was HUPed
Sep 14 08:03:58 motile anacron[790]: Job `cron.weekly' started
Sep 14 08:03:58 motile anacron[3068]: Updated timestamp for job `cron.weekly' to 2020-09-14
Sep 14 08:03:58 motile anacron[790]: Job `cron.weekly' terminated
Sep 14 08:03:58 motile anacron[790]: Normal exit (2 jobs run)
Sep 14 08:03:58 motile systemd[1]: anacron.service: Succeeded.
Sep 14 08:08:58 motile systemd[1]: Starting Cleanup of Temporary Directories...
Sep 14 08:08:58 motile systemd[1]: systemd-tmpfiles-clean.service: Succeeded.
Sep 14 08:08:58 motile systemd[1]: Finished Cleanup of Temporary Directories.
Sep 14 08:09:18 motile pulseaudio[1750]: E: [alsa-sink-ALC269VC Analog] alsa-sink.c: ALSA woke us up to write new data to the device, but there was actually nothing to write.
Sep 14 08:09:18 motile pulseaudio[1750]: E: [alsa-sink-ALC269VC Analog] alsa-sink.c: Most likely this is a bug in the ALSA driver 'snd_hda_intel'. Please report this issue to the ALSA developers.
Sep 14 08:09:18 motile pulseaudio[1750]: E: [alsa-sink-ALC269VC Analog] alsa-sink.c: We were woken up with POLLOUT set -- however a subsequent snd_pcm_avail() returned 0 or another value < min_avail.
Sep 14 08:11:50 motile pulseaudio[1750]: E: [alsa-source-ALC269VC Analog] alsa-source.c: ALSA woke us up to read new data from the device, but there was actually nothing to read.
Sep 14 08:11:50 motile pulseaudio[1750]: E: [alsa-source-ALC269VC Analog] alsa-source.c: Most likely this is a bug in the ALSA driver 'snd_hda_intel'. Please report this issue to the ALSA developers.
Sep 14 08:11:50 motile pulseaudio[1750]: E: [alsa-source-ALC269VC Analog] alsa-source.c: We were woken up with POLLIN set -- however a subsequent snd_pcm_avail() returned 0 or another value < min_avail.
Sep 14 08:16:53 motile rtkit-daemon[1109]: Supervising 5 threads of 3 processes of 1 users.
Sep 14 08:16:53 motile rtkit-daemon[1109]: Supervising 5 threads of 3 processes of 1 users.
Sep 14 08:16:57 motile rtkit-daemon[1109]: Supervising 5 threads of 3 processes of 1 users.
Sep 14 08:16:57 motile rtkit-daemon[1109]: Supervising 5 threads of 3 processes of 1 users.
Sep 14 08:16:57 motile rtkit-daemon[1109]: Supervising 5 threads of 3 processes of 1 users.
Sep 14 08:16:57 motile rtkit-daemon[1109]: Supervising 5 threads of 3 processes of 1 users.
Sep 14 08:16:57 motile rtkit-daemon[1109]: Successfully made thread 3233 of process 2646 owned by '1002' RT at priority 10.
Sep 14 08:16:57 motile rtkit-daemon[1109]: Supervising 6 threads of 4 processes of 1 users.
Sep 14 08:17:01 motile CRON[3251]: pam_unix(cron:session): session opened for user root by (uid=0)
Sep 14 08:17:01 motile CRON[3252]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly)
Sep 14 08:17:01 motile CRON[3251]: pam_unix(cron:session): session closed for user root
Sep 14 08:30:01 motile CRON[3612]: pam_unix(cron:session): session opened for user root by (uid=0)
Sep 14 08:30:01 motile CRON[3613]: (root) CMD ([ -x /etc/init.d/anacron ] && if [ ! -d /run/systemd/system ]; then /usr/sbin/invoke-rc.d anacron start >/dev/null; fi)
Sep 14 08:30:01 motile CRON[3612]: pam_unix(cron:session): session closed for user root
Sep 14 08:32:49 motile systemd[1]: Started Run anacron jobs.
Sep 14 08:32:49 motile anacron[3671]: Anacron 2.3 started on 2020-09-14
Sep 14 08:32:49 motile anacron[3671]: Normal exit (0 jobs run)
Sep 14 08:32:49 motile systemd[1]: anacron.service: Succeeded.
reboot
I should take a look at which tasks are taking care those anacron jobs...