Sorry to hear about your experience. In addition to Monika's response, I'd recommend following instructions to save .AIC extension files on this help article.
This happens regardless of battery life, this has been happening every time I use it for about the past week. It sometimes happens as soon as I begin to make changes in the files or happens after a little while (20-30 mins.) I haven't tried saving to desktop yet so I will try that. And I am not sure what you mean by what is in the file?