Location of OpenWrt Crash Logs

I'm experiencing a strange problem of OpenWrt router randomly restarting, especially when there's a USB device plugged in. Are there any crash logs in OpenWrt that I can inspect? What could be the possible troubleshooting/investigating steps?
There are no visible errors or alerts in the boot log. it sits idle, and suddenly trips.

BusyBox v1.30.1 () built-in shell (ash)

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          |__| W I R E L E S S   F R E E D O M
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 OpenWrt 19.07.5, r11257-5090152ae3
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root@OpenWrt:/#              
root@OpenWrt:/# [  184.919598] mv88e6085 d0032004.mdio-mii:01 lan0: Link is Up - 1Gbps/Full - flow control rx/tx
[  184.928760] br-lan: port 1(lan0) entered blocking state
[  184.934091] br-lan: port 1(lan0) entered forwarding state
[  184.941629] IPv6: ADDRCONF(NETDEV_CHANGE): br-lan: link becomes ready

root@OpenWrt:/#         <<< Sits here for a while, the next line is the Reboot
root@OpenWrt:/# TIM-1.0
WTMI-armada-17.10.5-bb8f823
WTMI: system early-init
SVC REV: 5, CPU VDD voltage: 1.155V

Fill memory before self refresh...done

Now in Self-refresh Mode
Exited self-refresh ...
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