I have error 0x800CCC0E , Outlook 2013 cannot download. Nothing changed, just started on its own

I am getting the following error message when I check for new mail and nothing is sending from my outbox.  I have changed nothing on system at all, it just started happening about 9.30 last night.  Messages send and receive fine on webmail. I have tried rebooting (several times) changing timeout settings, disabling email antivirus etc etc .  Nothing works. No problem with internet connection. I am also getting loads of prompts for entering my password for email server and I know the correct details are already entered.  I'm pretty fed up now. 

Task '[my email address]: Folder:Inbox Check for new mail.' reported error (0x800CCC0E) : 'Outlook cannot download folder Inbox from the IMAP e-mail server for account [my email address]. Error: Cannot connect to the server. If you continue to receive this message, contact your server administrator or Internet service provider (ISP).'

Please can someone suggest what might be wrong.