A big mistake I see is the decision to bring in new managers who don't know the job. "You were good in leading that department" does NOT mean they will be good in a completely different department. Then it's like having a newly-elected mayor coming in and telling the fire department how to fight fires. They have all of the authority but none of the ability.
Big problem. Repeated problem.
A good observation from @7mmw+1adtfEOo, bumped for visibility.