The information was gathered from exits interviews conducted by the GRA
More Gardaí are blaming bullying and unfair treatment as their reasons for leaving the force.
106 officers have left the force early this year, around the same number as last year and more than double the number in 2017.
The GRA has conducted exit interviews with 40 of those quitting so far this year.
Tara McManus, Assistant to the General Secretary of the GRA, says many reasons are common:
"The number one reason why they were leaving was due to a sense of feeling that they has been subject to unfair treatment, discipline or the threat of discipline or that they've been bullied by management.
"The two other top answers were suffering from work related stress, mental health issues and burnout and the third reason was feeling that the workload was too much, that there were not the resources to do their job."
