Solution
m12ii is a Tier D PSU. This is not the m12ii-520 X50 watts Tier C which is already better but not by that much.

Since it doesn't look like you're having an overheating issue I would say that your m12ii-520 decided to crap out and just shutdown your system when you start asking more juice out of it.
m12ii is a Tier D PSU. This is not the m12ii-520 X50 watts Tier C which is already better but not by that much.

Since it doesn't look like you're having an overheating issue I would say that your m12ii-520 decided to crap out and just shutdown your system when you start asking more juice out of it.
 
Solution