This seems to be a firmware / hardware issue with Dell Laptops - the BIOS reports "ASF2 force off" events when these shutdown happens, which is a problem experienced by many other Dell customers, as can be seen here - http://en.community.dell.com/support-forums/laptop/f/3518/t/19612919 - and several other Dell community forum posts.
This seems to be a firmware / hardware issue with Dell Laptops - the BIOS reports "ASF2 force off" events when these shutdown happens, which is a problem experienced by many other Dell customers, as can be seen here - http:// en.community. dell.com/ support- forums/ laptop/ f/3518/ t/19612919 - and several other Dell community forum posts.
I've closed this ticket as invalid.