Repeated Problem with Server Timing out on MacBook Mail App

USMProfessor

I have had ongoing problems with my Mail app on my MacBook Pro - Operating System and Apps are all updated daily and are current.

Intermittently, my mail gets hung up - almost daily as of late - with the following error message:

Online Status: Connections to the server "mail.twc.com" on the default ports timed out.

After troubleshooting, I can't see there is a problem with any of my settings:

Username: [includes my full email address] - for both incoming and outgoing

Host Name: mail.twc.com - for both incoming and outgoing

Incoming Port: 993 - uses TLS/SSL

Outgoing Port: 587 - uses TLS/SSL

Note: I am using IMAP.

May I get some assistance as to how to correct this problem?

Thank you.