A sudden cabin decompression could account for a sudden (controlled) descent to where the aircraft levelled off to increase oxygen levels, however, not that steep and again... no radio communication.
Something or someone prevented communication.
Horizontal and vertical stabilisers, even aileron faults could be contributing factors.
The levelling off and slight altitude increase is very odd, like pilots have regained control briefly, then lost it again, but again... no radio distress calls.
It's not surprising in the video that there have been no human remains found... likely more accurately no 'intact' human remains have been found.
You see how the aircraft is largely just fragments... that's what happens to human bodies as well with an impact of that speed... they explode.
I have doubts the black (actually orange) boxes would have even survived.
An explosion on board, some other form of catastrophic systems failure or human intervention on the flight deck.
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