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I noticed that the logic doesn't present the problem when it's alone, only with the battery and SSD.
I was testing putting it in the topcase and connecting the other items. It seems like when I plug in the trackpad, that's when the problem happens. Tried with another trackpad, and same problem. I'm checking it out!
Crazy logic!!! After being well without the trackpad for hours, now it's back to the problem. I will try to measure the voltage of the U7100 when I am having the problem.