Benny,
The thinking on the Break=on is that in some cases, KiX may have a kill-resist. So, you're trying to hold KiX with Sleep... not reliable with different processor speeds... Maybe could consider Shell instead of Run. Also, maybe try to run shutdown from logon.bat using exit code.
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.