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Thanks @fbara for suggestion to add more details

Device: MacBook Pro (Retina, 15-inch, Mid 2014)

OS: 10.11.6 (15G1004)

pmset -g log from one of the times it occurred

UUID: (null) 2016-09-07 20:15:11 -0700 Start powerd process is started 2016-09-07 20:15:11 -0700
Summary- [System: No Assertions] Using Batt(Charge: 81) 2016-09-07 20:15:11 -0700 Assertions Kernel Idle sleep preventers: IODisplayWrangler 2016-09-07 20:15:43 -0700 Assertions PID 104(hidd) Created UserIsActive "com.apple.iohideventsystem.queue.tickle" 00:00:00 id:0x0x9000001f5 [System: PrevIdle DeclUser kDisp] 2016-09-07 20:16:52 -0700 Assertions PID 261(Google Chrome) Created NoDisplaySleepAssertion "Playing video" 00:00:00 id:0x0x500000223 [System: PrevIdle PrevDisp DeclUser kDisp]

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    Please don't start a new question to add details, edit your original which will then add it to the review queue to be re-opened. – Tetsujin Sep 8 '16 at 17:07
  • I concur with Tetsujin - rewrite your original question. Also, issue the following command syslog | grep -i "shutdown cause" and post the results. You may also want to run Apple Hardware Test (AHT). Hold the D key while booting from a powered off state with the AC adapter connected. This will help you determine if you have a hardware issue – Allan Sep 8 '16 at 17:20
  • Ah that makes sense. My thought was to open a new one because the original has -4 votes, so I figured it was as good as dead. Is that false? – tobeannounced Sep 8 '16 at 17:42
  • Previous shutdown cause: -128 – tobeannounced Sep 8 '16 at 17:43
  • Reference code PPT004 -- the battery requires service – tobeannounced Sep 8 '16 at 18:18
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Please make sure you also check your Macbook for excessive dust inside!

I have a Macbook pro which shutdown randomly (and gave the shutdown cause -128 error, and also the reference code PPT004 - the battery requires service). When I cleaned the build up dust it started functioning normally again!

I just removed the backplate and used a can of compressed air to clean it. Check https://www.ifixit.com/Device/Mac_Laptop to see how you can remove the backplate of your model.

PS: Try not to touch any parts inside, because of static discharge

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