I sense that this thread is straying far afield from the original subject title.
This is not the place to discuss weather and icing issues beyond what is stated in FCOMs. Perhaps a new general thread in the technical section might suffice.
Just to illustrate the complexitity of the discussion
Icing can cause engine problems due to probe blockage; or accretion and sheds resulting in damage; or vibration from uneven sheds; or sheds which mometarily disrupt the airflow.
Simply citing icing as a speculative cause without relating specific factual support applicable for an incident under discussion is like looking for a red herring.