I have added our org specific nuget package sources that has urls pointing to our local network for which I have complete access. After adding it by checking the checkbox in the package manager settings and closing the window, when I check the list of package sources again, one specific package source is getting removed ("unchecked") automatically. Either visualstudio or nuget extension removes the source. The same source was working sometime back. Not sure if it has anything to do with VS/OS updates. At the same time, other custom package sources are working and other team members are not facing this issue.
