A330 goes into a spiralling dive

[Arnold]

On my 2 most recent flights in the A330, my plane out of nowhere went into a spiral and crashed.

The first flight was from JFK to Amsterdam. I was still in the climb phase. I am not sure if the spiral dive came before the auto pilot disconnect or after. 

The 2nd flight was from Athens to Amsterdam. I had been in cruise mode for some time. The plane deviated from course without actually disconnecting from the auto pilot. 

Then the spiral dive came followed by the crash.

Has anyone else have any experience of this?

I was looking forward to buying the A350 but I'm a bit hesitant now as I don't know if this happening across the inibuilds range of airbus aircraft.