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I have a windows 2012 R2 server that seems to shut down every 4 hoursI struck this problem a couple of times a few years ago and it turned out to be caused by some of the servers setup tasks not being completed successfully and in another case, the server had reverted back to not activated and had to be reactivated again. Not sure if that will apply to you, but might be worth a look.
This topic area includes legacy versions of Windows prior to Windows 2000: Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions including Windows Mobile.
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It's either a STOP code, a correct shutdown entry, or the event log will complain about an "unexpected shutdown".
Please find those entries so we have more to go on.