I dont understand why you didn't wiped totaly the device, then did a clean install of W10. It took only an hour to instal and update my SP4. It should have solved all your problems.
Anyway, I do agree with you about MS quality control. There is no way a rookie customer can be happy with a SP out of the box, like you can with an apple product.
That said, I have my device since 6 days, and aside from my flickering at low brightness, and the auto brightness ajust that we can't turn off (I think the two problems are linked), my SP4 is working flawlessly.
Anyway, I do agree with you about MS quality control. There is no way a rookie customer can be happy with a SP out of the box, like you can with an apple product.
That said, I have my device since 6 days, and aside from my flickering at low brightness, and the auto brightness ajust that we can't turn off (I think the two problems are linked), my SP4 is working flawlessly.