Have an ASUS Ultrabook, Windows 8.1 4Gb of memory, that occasionally just shuts down for no apparent reason.
I’ve suspected eM Client for some time. It occasionally stops functioning (won’t pick up mail) and when I close it, it remains in memory and won’t re-open. If I now restart my computer, eM Client now has to go through its lengthy database check. This used to be a weekly problem but I’ve now had 3 of these freezes and 2 spontaneous shutdowns in the last few days.
I have now taken to keeping eM Client closed until I need to pick up mail. Too early to tell for sure that eM client is the culprit in the shutdowns but will wait to see if the shutdowns happen when eM Client isn’t active.