ZBT WD323 Router Power Cycles every 30 seconds

[AndrewZ]

The answer is there:

@Dairyman

it has a hardware watchdog monitor that requires a heartbeat on
GPIO 2 or else the router will reboot after a short period.

Make sure the GPIO number is the same then run a script that toggle that GPIO every second. You can probably get the ready to use script from the build system mentioned there.