You know you have an unhappy work environment when many of the employees leave in quick succession. Naturally people change jobs, going from one company to another. Yet if a significant number of people quit the department, you know there is something wrong.
One department that I used to work in, which shall remain nameless, had one associate consultant, two resident specialists and one resident leave in quick succession. This left the department short-staffed for some time before it could recruit people to join their team. Many of those left behind may have complained of the situation there were dealt with but if you know the circumstances and reasons why so many people left, you would probably understand.
Many doctors in the Hospital Authority want to go into the private sector, sooner rather than later as they want to control their own working hours and conditions. Others don't like the working conditions they are dealt with, mostly the rules and regulations they are imposed with. Some are dissatisfied with the boss they are working with. Others just want to change their specialty having found out they don't like the current specialty they are working. Some doctors, mainly women, start to work part time so they can take care of their kids. There are a whole variety of reasons why people leave.
What people don't want to be is part of a sinking ship.