I have once similar problem with restarting,hanging up in middle of job,turning off... in no specific order,just randomly,sometimes few days without problem, so hard to troubleshot.
After long time finding solution problem was resolved replacing sub power switch (right side of control panel).
When measure with multimeter resistance fluctuate from 10 to 60 ohms and should be arround 1 ohm for proper working.
You have always same turning off but worth try to check this in 10 minutes.
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