Not the reason that I stopped going, but I wanted to add my DITTO to the idea that people in AA often have a horrible tendency of dispensing medical and medication advice at meetings.
The people I was closest with in my old home group knew all about my severe mental health issues and understood well-enough that I needed more than AA for peace of mind and the tools to stay sober. Though there were also numerous occasions where getting psychiatric treatment was scoffed at by some who felt that if I was more monogamous to the program I wouldn't need medication.