The system crashes, without any trace in logs | Arch Linux Community | Page 1

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After some time, my system just freezes, the screens go blank, and it reboots. The system has crashed at 20:39:44s (i have seen on polybar just before reboot). The journalctl says nothing about what happened at this time (the journalctl content is on the screen).
journalctl -b -p err says no entries.
The only place where i actually could have any logs, is /var/log/wtmp and /var/log/lastlog, but both of them are binary files and i cannot read them.
My pc:
cpu: ryzen 5 2600 OC to 4ghz
ram: aegis g.skill 16gb 3000mhz
gpu: rx 580 4gb sapphire nitro plus
drive: samsung 860 evo sata 500gb
mobo: msi b450 tomahawk

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i use kernel linux-zen. It happens for last few months (on default kernel too)

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my computer does not overheat

#The system crashes, without any trace in logs