Edmund......This is not new, before the Air Caraibis incident my Airline had a similar thing occur over the South China sea in an A330. They had their pitot probes ice up from super cooled water and they then had all the same things happen.
AP A/THR dropped out
Simultaneous overspeed AND under speed warnings
Alternate Law
Etc etc
They were initial hung out to dry but the union proved the Radar was at fault and the crew hadn't actually exceeded any limitations.
So, the Airline changed the Radars on all the 330's and changed the Pitot tubes to the newer model.
This is not a new thing..