Search for Edit Power Plan and, select Change advanced power settings and set "Allow wake timers" to "Disable" under both the "On battery" and "Plugged in" sections. Open Task Scheduler and look for any tasks that are set to wake the computer and disable them. Also open Device Manager and check devices that might be causing the wake-up issue. Right-click on the device, select Properties, go to the Power Management tab, and uncheck the option "Allows this device to wake the computer".
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