I seem to be a bit late here, but this bug affects me, too.
I have your same laptop and I am experiencing it with Xubuntu 14.04.3 with 
kernel 3.13.0-63 and CentOS 7 with Gnome and kernel 3.10.0-229, thus i do not 
think this is Ubuntu fault.
It does not seem to be a Bios/Machine fault either: 
http://stackoverflow.com/questions/28752549/ubuntu-gnome-reboots-instead-of-poweroff/32460502#32460502
I have no clue on what may be important, but i would be happy to help dumping 
whatever info you need.

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https://bugs.launchpad.net/bugs/1256636

Title:
  Lenovo S531: restart after shutdown

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