Who is the account provider, and what are your authentication settings?

My account configuration has not changed, and was never forgotten by Thunderbird. It is POP3 protocol with Incoming and Outgoing Ports configuration saved locally. None of the credentials within the account are ever lost, only the password. My email account is private, not a third party like charter.net, comcast.net, that could have changing requirements; I own the email address as part of my private website. Thunderbird has never lost passwords from my other email accounts which are all part of my same private website. The problem is random...Thunderbird can remember the password on this 1 account for an hour, a day or 2, then suddenly Thunderbird forgets my password 4 times in one day...only on 1 of the 5 accounts. I have been using Thunderbird for years with no issues. I stated using the beta version after building my Linux based system. I am not using an extensions or add-ins, so I thought I would give it a try. I thought this problem could be due to the beta version, but since it is random, and only affects 1 of 5 accounts, I thought I should report it rather than re-install an older version and let it go unreported.

Thanks for the help and expertise.

Should I assume that I have totally stumped everyone, or have people just decided to use another mail program and went elsewhere? Right now, the best fix I have is to move to Evolution...that works, and it is supported. Ideas anyone?

You've reported an issue that occurs randomly, with an unsupported beta TB, with settings you have decided not to reveal. Not a recipe for prompting useful support advice. Add the account to a new profile with the release version and see if the problem remains.

Sorry, I did not know that I was holding you up without the Server Settings/port numbers.

I made the assumption, that Beta or Stable, you would want questions and feedback so that you could improve and stabilize the application..i.e. ignoring the reported bug because it came from Beta is not your goal (Please let me know if that is not true).

Here is the info that hopefully will get an answer for us, and you closer to a better product: Server Type: IMAP, Port: 993, Connection Security: SSL/TLS, Authentication method: Normal Password, Check for new messages at startup (yes), Check for new messages every "10" minutes (yes), Allow for immediate server notifications when new messages arrive (yes).

Let me know what else you need that can help you to make this a stable release in regards to my question.

Thanks

It's not really a bug unless you can specify Steps to Reproduce the issue, which may be difficult with a random occurrence. It's also not going to receive much attention with a beta version unless you can demonstrate its occurrence in a new profile with a single account, as suggested above. If you want to bring it to the attention of developers, who seldom visit this forum, the appropriate place is Bugzilla.

Thanks for the clarification.

Although I am retired, I am still operating under the processes and protocol that Microsoft did when I was part of their developer feedback network in the 1990s- 2000s. I identified 20+ bugs and 10+ known issues with MS Office, and that resulted in changes to code. The difference between bugs and known issues is that one was widestream and critical which resulted in patch/release and the other resulted in edits to documentation.

Both however, always included items that resulted in an application 'not performing as intended', and that is what this is. Also, many times the attention to fixing one bug, results in downstream improvements and fixes that were not even known at the time, so there is a much broader benefit to addressing it than fixing an bug that irritates just me.

So that I don't waste any more of your time, if this forum is not for addressing bugs (yes it is a bug), then what is its purpose?

The purpose is to help users with 'using' TB, as you can tell by browsing the forum. This sometimes involves actual bugs, which again is evident by browsing the forum. You are free to post your issues here or in any of the other similar forums, and wait for a volunteer to address it. If you wish to contact developers, the Bugzilla forum mentioned already is the best option.