Why is mail server timing out suddenly?

I've been saving all my mail to folders in iCloud for six months. Suddenly in the past week, every time I go to save an email with an attachment, I'm getting the error message

ERROR

The connection to the server "P04-imap.mail.me.com" on port 993 timed out

and I cannot save any emails with attachments anymore. What has changed? My iCloud storage shows that I still have 5 Gigs of storage available.

Is there anything I can do about this?

Christine Kling