Cause: cannot be determined from the facts on hand.
Established facts only cover (1) the observed error/failure signature and (2) external conditions at the time — neither is a stated root cause, and no other evidence (maintenance records, ATC transcripts, wreckage analysis, etc.) has been supplied.
The scratch note about black-box flight recorder data is the right next step, not an answer: CVR/FDR data (if recovered and intact) is what would let investigators correlate the failure signature with the external conditions and pinpoint a definitive cause. Until that data (or equivalent investigative findings) is available, any specific cause would be invented rather than grounded.
**Pending action for user confirmation:** pulling/reviewing flight-recorder (CVR/FDR) data, if you want me to proceed on that as the next step — confirm before I treat it as sourced evidence.
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