Lotto Probability - but cosmic radiation possibility
If the obvious holds no explanation then look for the weird.
Current computer microprocessor registers are tiny, of the um range. Bits in these registers (which control the plane) can be altered by passing cosmic particles.
Is it possible that exactly the right bits in the aircrafts computers were set - at just the right time - by random radiation - commanding engine shutdown? Just like winning Lotto.
Someone always wins Lotto against impossible odds!