Credential Providers intermittently prompts for credentials

Description

Following the description at the documentation page I have set up our Azure DevOps build agents, i.e.

• Extract the CredentialProvider.VSS.exe file into the above path (%LOCALAPPDATA%\NuGet\CredentialProviders)
• Run
  CredentialProvider.VSS.exe -U NUGET_FEED_URL
  Then enter user name and password.

This seems to work for a few weeks (unsure of the time period, maybe 4-8 weeks) and then the build process starts asking for credentials again, there by blocking builds on our agents.

Repro steps

Unfortunately there are no specific steps to reproduce this issue. Maybe someone can confirm if the steps I have taken to setup the Credential Provider are correct?

Expected behavior

I would expect, once the Credential Provider is setup, paket resolves credential and doesn't forget it after a few weeks to have to re-enter password on every single build agent.

Actual behavior

Paket forgets the credentials and build fails with the following log:

Paket version 5.215.0
Resolving packages for group Main:
Performance:
 - Resolver: 7 seconds (1 runs)
    - Runtime: 107 milliseconds
    - Blocked (retrieving package versions): 7 seconds (1 times)
 - Runtime: 8 seconds
Paket failed with
-> Unable to retrieve package versions for 'EWSoftware.SHFB'
   -- CLOSED --
      
   -- OPEN ----
      EWSoftware.SHFB == 2017.12.30.2

Known workarounds

I do not know of a proper workaround. I go on every single build agent to re-configure the Credential Provider as explained in the Description section.
Once re-configured, paket works as expected for few more weeks.

Start by reviewing the credential-provider documentation and the CredentialProvider.VSS.exe setup command described in the issue, then reproduce the configuration on an Azure DevOps build agent if possible. Investigate why Paket or the provider stops resolving credentials after several weeks; done means builds continue without prompting after the documented setup, with regression coverage or documented reproduction steps.