I tend to think fire myself, pilots shut down the circuits one by one to eliminate the source, maybe they had a cockpit full of smoke but no actual fire, that would be the lack of communication, dropped it down fast and turned looking for an airport, they may have lost track of sequences in the panic and forgot to turn comms back on as they were trying to control things.
Granted there are plenty of holes in it but terrorism makes no sense or pilot suicide, in either of these you get the process over quickly and generally with alot more fanfare.
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