My Dell XPS 15 with Windows 10 turns on immediately after turning off.
The same with Sleep or Hibernate.
I googled the issue and found following suggestions: - disable wake events in Bios - Disable wake for usb devices (unfortunately, my mouse do not have Power options tab)
So far I have no idea what cause wake, event log entry is not helpful:
The system has returned from a low power state.
Sleep Time: 2017-03-27T20:53:24.368136500Z
Wake Time: 2017-03-27T20:53:59.366750800Z
Wake Source: Unknown
Here there are suggestion to locate program for windows 7 but this do not work for windows 10 Pro: How do I find out which one of those pesky programs keeps waking my machine from sleep?