emClient not receiving mails

Hello forum
All of a sudden I am getting the red triangle and inbound mails are not coming into emClient. I am on the latest version. No changes have been made to settings, no new programs loaded (or antivirus etc) etc.
Have been a regular daily user of eMclient for many years. Emails are visible on my webmail account. Outbound works ok.
Error is:[POP3] Connection terminated prematurely

Any help is appreciated
Thanks