Imac turns off when going to sleep

Hi,
My imac shutdowns and I need to manually turn it back on - it has happened a few times now when I put my computer to sleep. Anything I can do to stop this? Should I be contacting Apple? Is this a big issue? Thanks Bethany
Console messages from first time today:
10-11-27 8:52:14 AM com.apple.launchd[1] * launchd[1] has started up. *
10-11-27 8:52:45 AM com.apple.launchd.peruser.50187 (com.apple.ReportCrash) Falling back to default Mach exception handler. Could not find: com.apple.ReportCrash.Self
10-11-27 8:52:53 AM com.apple.WindowServer66 Sat Nov 27 08:52:53 bethany-padusenkos-iMac.local WindowServer66 <Error>: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
10-11-27 8:52:56 AM com.apple.launchd.peruser.50187 (com.apple.Kerberos.renew.plist107) Exited with exit code: 1
10-11-27 8:53:00 AM com.apple.launchd.peruser.50187 ([email protected]) Exited with exit code: 1
Console message from second time that it turned off today:
10-11-27 1:50:32 PM com.apple.launchd[1] * launchd[1] has started up. *
10-11-27 1:50:56 PM com.apple.launchd.peruser.501[93] (com.apple.ReportCrash) Falling back to default Mach exception handler. Could not find: com.apple.ReportCrash.Self
10-11-27 1:51:00 PM com.apple.launchd.peruser.501[93] (com.apple.Kerberos.renew.plist[121]) Exited with exit code: 1

If the computer successfully goes to sleep/wake, it will post lines in console like this:
Nov 28 18:56:47 computername kernel[0]: System Sleep
Nov 28 18:56:53 computername kernel[0]: System Wake
Do you get any lines like these around the time it happens?
Also, resetting the SMC might be a good thing to try:
support.apple.com/kb/ht3964

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Imac turns off when going to sleep

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