I am experiencing intermittent issues with saving models in ModelBuilder. The error message is Save Failed. Failed to save model followed by the file path but with the incorrect model name at the end (e.g. 'Model' or 'Model1'). The issue has only started today. As a workaround if I use Save As and overwrite the existing model in the toolbox, and then press Save it works. It's almost as if ModelBuilder is forgetting the name of the model to save as.