HKPAX:-- Please read my post above. Or better still read the actual QRH you have.
All or 2 of the Pitot probes iced up ( basically failed ) and "confused the system" Overspeed/Under speed warnings resulted, Alt Law, AP A/THR dropped out ......etc etc....
It would have all cleared up after they exited the cloud........
Airbus and Boeing have addressed this issue of super cooled water drops and directed that improved pitot probes be fitted.