Messages not downloading

All of a sudden one of my POP3 AT&T/Bellsouth accounts has stopped downloading messages. Been the case for several hours now.  “Downloading messages” just hangs. The other account (same provider) is fine.  The messages do appear in my AT&T Currently mail box just not downloaded to eM Client.  Any suggestions for a fix ? Thanks.

i am having same issue but with Roadrunner mail.  everything else is fine