I was recently terminated from a senior role in a Fortune 500 company just as I was approaching the one year mark.

I was recently terminated from a senior role in a Fortune 500 company just as I was approaching the one year mark. A week prior to being terminated, out of the blue my boss, during a regular weekly discussion, informed me that she was not satisfied with my performance. She cited examples of this supposed poor performance but they were weak. In fact I had feedback from others who worked with me on those projected who praised my work. When I mentioned this to her, she told me this is how she feels and asked me to think about what steps I would be taking to improve and correct my performance. She said next time we speak she wants me to be prepared to inform her what steps I would be taking. First, I was taken by surprise because in all the other work I had done all I ever received was praise from my boss. In fact just the week prior to this negative feedback I received an email from my boss stating that I had done an excellent job on a project. So therefore adding to my confusion. And how am I supposed to come to the table with steps I would take when I did not understand why this all of a sudden turned sour? And she also followed up our conversation with her views stated in writing which she emailed to me. So, at my next meeting with her, after stressing and thinking through what steps I might want to take to improve I did not even have a chance. That very next meeting I was informed that she was terminating my position. Has this happened to anyone else? I am still hurt, side blinded and left dumbfounded. And now I am worried about what to do as I am not sure how to explain this to a prospective new employer if asked why I left this role. Any help or advice would be greatly appreciated.