Unable to send or receive......error message

Hello! A little help needed! This error message keeps coming up on my wife's laptop when checking her email. (Running Windows 10 and Microsoft Live 2012 for her email client.) This is what shows up when she tries to access her email: note....I took out her username and added "username here". Unable to send or receive messages for the Cox (username is here) account. Header download for the 'Inbox' folder did not complete. Your server has unexpectedly terminated the connection. Possible causes for this include server problems, network problems, or a long period of inactivity. Server Response: Your IMAP command could not be sent to the server, due to non-network errors. This could, for example, indicate a lack of memory on your system. Server: 'imap.cox.net' Windows Live Mail Error ID: 0x800CCC0F Protocol: IMAP Port: 993 Secure(SSL): Yes I've checked all the property settings and they are identical to what I have on my laptop. Sometime she can check for email and it works....other times she gets the above error message. The part about: "Header download for the 'Inbox' folder did not complete" makes no sense to me.??????? Thanks for your assistance in resolving this problem. CWJ