IMac shuts down unexpectedly when not in use

When I get back to my iMac after a long pause, it has shut down.
This is the log for what happened just before it shut down the last time.
21. des. 2014, 19.07.26 CalendarAgent[1323]: [com.apple.calendar.store.log.caldav.coredav] [Refusing to parse response to PROPPATCH because of content-type: [text/html; charset=UTF-8].]
21. des. 2014, 19.08.25 CalendarAgent[1323]: [com.apple.calendar.store.log.caldav.coredav] [Refusing to parse response to PROPPATCH because of content-type: [text/html; charset=UTF-8].]
21. des. 2014, 19.08.25 CalendarAgent[1323]: [com.apple.calendar.store.log.caldav.coredav] [Refusing to parse response to PROPPATCH because of content-type: [text/html; charset=UTF-8].]
21. des. 2014, 19.08.32 mdworker[18669]: Failed to obtain sandbox extension for path=/Users/elfinn/Library/Caches/mdworker. Errno:1
21. des. 2014, 19.08.33 mdworker[18669]: Failed to obtain sandbox extension for path=/Users/elfinn/Library/Caches/mdworker. Errno:1
21. des. 2014, 19.08.33 mdworker[18670]: Failed to obtain sandbox extension for path=/Users/elfinn/Library/Caches/mdworker. Errno:1
21. des. 2014, 19.08.33 mdworker[18670]: Failed to obtain sandbox extension for path=/Users/elfinn/Library/Caches/mdworker. Errno:1
21. des. 2014, 19.08.33 mdworker[18671]: Failed to obtain sandbox extension for path=/Users/elfinn/Library/Caches/mdworker. Errno:1
21. des. 2014, 19.08.33 mdworker[18671]: Failed to obtain sandbox extension for path=/Users/elfinn/Library/Caches/mdworker. Errno:1
21. des. 2014, 19.09.26 CalendarAgent[1323]: [com.apple.calendar.store.log.caldav.coredav] [Refusing to parse response to PROPPATCH because of content-type: [text/html; charset=UTF-8].]
21. des. 2014, 19.09.26 CalendarAgent[1323]: [com.apple.calendar.store.log.caldav.coredav] [Refusing to parse response to PROPPATCH because of content-type: [text/html; charset=UTF-8].]
21. des. 2014, 21.00.20 distnoted[1293]: # distnote server agent absolute time: 130.864989531 civil time: Sun Dec 21 21:00:20 2014 pid: 1293 uid: 506 root: no
21. des. 2014, 21.00.35 mdworker[1312]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8283710070
21. des. 2014, 21.00.36 mdworker[1312]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8285102890
21. des. 2014, 21.00.36 mdworker[1312]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8283505850
21. des. 2014, 21.00.36 mdworker[1312]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8283715960
21. des. 2014, 21.00.37 mdworker[1312]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8285106d90
21. des. 2014, 21.00.37 mdworker[1312]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f828500cad0
21. des. 2014, 21.00.50 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe0e19a80
21. des. 2014, 21.00.54 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe0f0b080
21. des. 2014, 21.00.54 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe0c21a40
21. des. 2014, 21.00.55 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe0d214b0
21. des. 2014, 21.00.55 mdworker[1305]: Failed to obtain sandbox extension for path=/Users/elfinn/Library/Caches/mdworker. Errno:1
21. des. 2014, 21.00.55 mdworker[1305]: Failed to obtain sandbox extension for path=/Users/elfinn/Library/Caches/mdworker. Errno:1
21. des. 2014, 21.01.10 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe33066f0
21. des. 2014, 21.01.14 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe3106470
21. des. 2014, 21.01.15 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe0f04f10
21. des. 2014, 21.01.15 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe3207780
21. des. 2014, 21.01.34 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe0e1f0c0
21. des. 2014, 21.01.34 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe33104b0
21. des. 2014, 21.01.34 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe0e21a10
21. des. 2014, 21.01.34 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe0e152e0
21. des. 2014, 21.01.58 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal Threw error #203 (Duplicate property or field node)
21. des. 2014, 21.01.59 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal Threw error #203 (Duplicate property or field node)
21. des. 2014, 21.01.59 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal Threw error #203 (Duplicate property or field node)
21. des. 2014, 21.01.59 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal Threw error #203 (Duplicate property or field node)
21. des. 2014, 21.01.59 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal Threw error #203 (Duplicate property or field node)
21. des. 2014, 21.01.59 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal Threw error #203 (Duplicate property or field node)
21. des. 2014, 21.01.59 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal Threw error #203 (Duplicate property or field node)
21. des. 2014, 21.01.59 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal Threw error #203 (Duplicate property or field node)
21. des. 2014, 21.01.59 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal Threw error #203 (Duplicate property or field node)
21. des. 2014, 21.02.11 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal Threw error #203 (Duplicate property or field node)
21. des. 2014, 21.02.14 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal Threw error #203 (Duplicate property or field node)
21. des. 2014, 21.02.14 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal Threw error #203 (Duplicate property or field node)
21. des. 2014, 21.02.15 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal Threw error #203 (Duplicate property or field node)
21. des. 2014, 21.02.15 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal Threw error #203 (Duplicate property or field node)
21. des. 2014, 21.02.15 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal Threw error #203 (Duplicate property or field node)
21. des. 2014, 21.02.18 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe3107a10
21. des. 2014, 21.02.18 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe0c237d0
21. des. 2014, 21.02.18 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe0d2a470
21. des. 2014, 21.02.18 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal Threw error #203 (Duplicate property or field node)
21. des. 2014, 21.02.57 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe3105ab0
21. des. 2014, 21.02.57 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe0f025c0
21. des. 2014, 21.03.00 mdworker[1320]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7f8fe0f029c0
21. des. 2014, 21.03.00 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal Threw error #203 (Duplicate property or field node)
21. des. 2014, 21.03.00 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal Threw error #203 (Duplicate property or field node)
21. des. 2014, 21.03.02 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal Threw error #203 (Duplicate property or field node)
21. des. 2014, 21.03.02 mdworker[1318]: ImageIO: CreateMetadataFromXMPBufferInternal Threw error #203 (Duplicate property or field node)

I have a similar issue with my older MacBook Pro 3,1 since Mavericks. In Mavericks it would completely freeze. In Yosemite it reboots.
On my machine somehow it is tied to whether I have Wifi turned on or off (whether associated with a connection or not). I typically use my computer near the router and turn off the wifi. Since Mavericks if I turn off my Wifi, it will eventually crash so I have to manually disassociate but leave wifi on to keep my computer from crashing. Not sure where the [com.apple.calendar.store.log.caldav.coredav] errors fit in but I always see them shortly before a crash if wifi is off.

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Please excuse my non techinical explanation of this problem !
Model: Macbook Pro5,1
OSX 10.5.7
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Im first time mac owner and have very little technical ability ... !
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Hi Bibii and welcome to Discussions,
first of, you have posted in the Mac Pro section not the MacBook Pro section here http://discussions.apple.com/category.jspa?categoryID=190
Anyway, is this really a shutdown or is it just sleeping ?
If sleeping check the Energy Savings settings in the System Preferences for when your MBP should go to sleep when inactive.
Regards
Stefan

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Set the Screen Saver Preference to Never.
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Check to be sure that Sleep or Shutdown are not Scheduled.
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3. Press and hold the power button for 5 seconds.
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Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
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IMac shuts down unexpectedly when not in use

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