Received this information from a member on here:
Matt a moderator on the Motorola Owners' Forum acknowledged the following:
Here is the link: https://www.motorola.com/feedback.jsp"A very small percentage of the doors are a the low end of our specifications. If you are having a problem with your door falling off, contact our call center. Use the link on our forum home page that says "Contact Us" and you can either call or chat or e-mail. We'll send you a new one.
Sorry for the problem."