My guess: super crappy (chinese) low budget voltage regulators. Not working near this field, but have had some practical related experience. Clarification: I d

My guess: super crappy (chinese) low budget voltage regulators. Not working near this field, but have had some practical related experience. Clarification: I don't think Samsung etc are using counterfeit inferior regulators - I suspect they are using inferior regulators because it makes the BOM cost lower.