Macbook pro mid 2010 started shutting down suddenly, why?

Question

macbook

Good day.
The old man completely unexpectedly and without declaring war began to pass out. It can "fall" at absolutely any moment of time, having worked at least 5 minutes, at least the whole day.
Macbook pro mid 2010 (id MacBookPro6,2 model MC373LL/A) memory expanded to 8 GB, DVD removed, hard drive via optibay, system on SSD Error
log - https://pastebin.com/ah6ujdvn j. The toaster did not allow publishing such a long text)
Where to dig? Reinstalling the system? Service center? Bury?