router get auto reboot while heavy downloading

[jack338c]

hello
I found the uptime is not good while PC using IDM to download win11 iso from ms offical
The load average like : 1.50, 1.64, 1.17 or more higer
and if I use sqm at same time,my openwrt router will get auto-reboot soon

openwrt router :EA7500 V1

did you meet similar issue before ,or is this normal?

thank you