Outlook 2010 randomly asking for password

I know this is a frequent complaint, but I have not found a viable solution to stop this problem.
I am using Outlook 2010 on Windows 8.1 (with all the latest updates)
About a month ago, Outlook started to randomly ask for the username and password on two of my accounts.
I have tried all the solutions that I could find, but none work.
I have 3 accounts set up, 1 for me on a POP account with Verizon, a 2nd for my wife also with Verizon, and a 3rd is an IMAP for work.
I do not have a problem with the work account, but the 2 POP accounts randomly ask for the username/password and by the time I press OK will fail.  Sometimes the scheduled send/receive works fine.
There were no credentials set up for these accounts (I have tried adding it and later removed it since it did not help)
I have tried removing the profile and readding as well as removing and adding the accounts again (using the same .pst files), losing my calendar in the process by the way.
If I manually initiate the send/receive, it usually works fine (I may have seen it ask for the PW once or twice)
The usernames and passwords are set up correctly and all the right boxes are checked.
I even set up groups so that the 3 accounts are scheduled at different intervals and the IMAP account only receives mail from the inbox without checking subscriptions and sends.
Any help would be appreciated,
Ken

Hi Ken,
Have you ever tried to clean the credential history cached in Windows Credential Manager? Sometimes incorrect credential cached in Credential Manager will result in this kind of issues:
Go to Control Panel, and then click Credential Manager.
Locate the set of credentials that has Outlook in the name.
Click the name to expand the set of credentials, and then click Remove from Vault.
For more steps to troubleshoot this kind of issue, you can refer to this ForumFAQ thread:
https://social.technet.microsoft.com/Forums/en-US/bcd2d9c2-1a1b-4446-bf32-69fee8cdf11b/why-does-outlook-keep-prompting-for-password?forum=outlook
Hope this helps.
Regards,
Ethan Hua
TechNet Community Support
It's recommended to download and install
Configuration Analyzer Tool (OffCAT), which is developed by Microsoft Support teams. Once the tool is installed, you can run it at any time to scan for hundreds of known issues in Office
programs.

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