My store had been closed with no email. And i contact with support team, then give an answer is: reason is secret and with Shopify's Terms of Service: We reserve the right to modify or terminate the Shopify Service or your Account for any reason, without notice at any time. And they didn't give me change to backup my database and proccess, support for my customers. I think they become a big e-commerce service and having huge customers, so value of their customers is zero.
P/s: sorry if my english is not good, but hope you can understand.