Commercial aircraft usually start descent around 20 minutes before expected arrival time. The Flightaware chart shows a steady slope of descent. Flightaware data isn’t perfect, but it’s close.
Airbus has a fly by wire problem..see this
“This sounds eerily like the alert our A320 crews recently received with regard to contaminated AOA probes. A red OEB is due to be released shortly.
While airspeed is fine, the aircraft “thinks” AOA is too high, and a forced nose down attitude occurs while in Normal Law.
The solution is to remove two ADRS, leaving one, placing the aircraft in Alternate Law and control can be regained. The crew can then stop the nose down command. (Which occurs with the autopilot on or off). “