None of which should cause a steep climb and an 'airspeed decrease near stalling speed.' It remains to be seen whether this was a system or human failure and with the FDR etc it should not be long.
My first look would be at manual throttle, poor speed control and autothrottle 'armed' kicking at 1.3Vs with TOGA and autopilot disconnect followed by big wide Scandi eyes, but as I say, it will all be in the data.