It sounds to me more like LAM470 than AF447. I just hope to to god it wasn't another deliberate accident by crew.
LAM470 vanished with no distress, squawk or maintenance messages sent and in the cruise in clear weather which is more similar to MAS370
Except that LAM470 was tracked on radar after it started abruptly descending from 38,000 feet.
Not here apparently. So I can't see any similarity at the moment.