I heard of one that was dissolved in the U.K Our new (then) C.O told me about it. Apparently he was on his very first visit on his own to a Congo. having been trained as a C.O and gone on visits with an existing C.O to other Congos.
He uncovered a terrible scandal, and discovered that every Elder on the body had covered it up ! I do not know what the scandal was.
He removed the whole B.O.E. The congregation then moved to another location, and apparently did well, according to this C.O, he had removed any possibility of accusations against the innocent congregation members.
The other one I know of is where a really power hungry family ruled a local Congo, dissolved and merged.
The funny one was where a Congo about 20 miles from me was split in to two, one half did fairly well, the other half spiralled down to next to nothing, within 2 years it was one Congo again. Still is I think.