Why is my Macbook Pro Retina shutting down unexpectedly once a day? Log provided


my macbook pro retina 2015 has been shutting down once day unexpectedly last 3 months.
tried resetting smc instructed on apple website, i'm not sure it's reset smc properly.

attaching text file of log (you can click "..." @ top right corner download rtf file)
https://www.dropbox.com/s/esyd6umwv2qxoxx/log.rtf?dl=0

can see, starts @ 23:28:31 , jumps
00:03:53 1 log entry , 00:17:28.

also, @ 00:17:31.540808+0100, can see smc message "kernel: (applesmc) previous shutdown cause: 3" means bad shutdown.

there indication why computer shut downs unexpectedly?

in advance
 

running on battery or mains power?
 


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