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Login problems to IMAP server

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Often can't log on to my IMAP email account at mail.optonline.net. "Login to mailserver xxxx.xxxxxx.xxx with username yyy failed." Sometimes it does work, but only after a long time and very laggy. Username and password and other settings are correct - checked and double checked. How do I fix it? This is a recent issue. Thanks!

Often can't log on to my IMAP email account at mail.optonline.net. "Login to mailserver xxxx.xxxxxx.xxx with username yyy failed." Sometimes it does work, but only after a long time and very laggy. Username and password and other settings are correct - checked and double checked. How do I fix it? This is a recent issue. Thanks!

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do you have an anti virus that might be scanning mail or internet connections?

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Yes, I use Avast Premium security. My T-bird program also auto-updated to 91.1.1 and has not been able to regularly login to the IMAP server, I believe, ever since. The program worked flawlessly before. Not being a tech wiz, and at age 82, I lack the background to solve this issue. Any help appreciated!

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BTW, I tried turning off Avast temporarily, and still can't log in to the IMAP server.