Similar happened to me. I had a steller 13 year career with the Bank (starting off as Barnett, then Nations, then BofA) and won several awards as others on this board did. I moved teams in 2009 and that was my fatal mistake.
Our manager would openly berate people (her team) in conference calls. She even took credit for work, produced by other teams, that was not ours! She was constantly traveling to "be seen" as, after 25 years with the Bank she was still a VP!!! (I worked my way up from a non-officer temp secretary to a VP in six years)
Finally, by hook or crook, she was promoted to SVP. She never even told her team...someone found out by looking her up in the corp directory.
I put up with her until....she was so venomous to my direct report (a very capable 50+ year old woman) that she made her cry. I reported my manager's behavior to Advice & Council and...surprise...I was written up by my manager a week later. The Write Up had NO END DATE. One of the bullets was "Takes too much initiative".
I had never in my life been written up and I responded within 24 hours to show how I had already fulfilled (before I was even written up!) all of the "To-Dos". I had a stack of emails and other evidence against her. Her manager told me "If you feel like you have to craft this much of a response, you are clearly guilty". It was ludicrous! Advice & Council would speak to me, but only to say "You need to work it out with your manager. It's at her discretion." This went on for 11 MONTHS!!!
Someone wised up. She was demoted and moved under an executive friend in a non-traveling, individual contributor position to hide out until retirement later that year. I resigned a few months later and was told that I was not eligible for rehire because I resigned while on Written Warning.
An employment attorney said what she did was not illegal. It was immoral, but not illegal...and they see it all the time.