The radome probably just collapsed due internal structural failure.
Possible. When a dome undergoes an inversion under stress, as this radome did, the process is called "snap-through", and can produce a substantial "thump" even if there is no collision with a specific object, just failure under a continuous load (airstream.) The thump can easily give the impression of an actual impact.
Just making an engineering point - I have no opinion yet as to what happened here.