DELL Precision 3520 powers on automatically

[Rekoo1997]

Laptop Model: DELL Precision 3520 Motherboard: CDP80 LA-E152P Rev 1.0 (A00)
Issue: The laptop powers on automatically after being shut down.
Actions Taken by Technician:

BIOS reflashed

Intel ME region cleared
Result: Issue still persists
Additional Observations:

Power button reads 3.3V (normal)

The problem occurs both when running on battery and when connected to AC adapter

[mon2]

If removable, remove the WIFI card and test again. Perhaps waking up due to the PCIe wake line.