I was convinced it was software related and Sony just working the bugs out. Be cautious when buying. I normally wear a 91/2 but size up if half sizes are not an option. I am so disappointed with the shoe that I feel like a review was instantly needed. I purchased for my wedding in September 2017. I have a narrow foot so they fit a bit loose. The list of problems encountered with this purchase are more than mentioned above. There is no need to dress in heels at work right now. buy the M6 and send me the rest =)! Makes me wish I was 50 years younger and starting over in a career.