Windows 7 Mapped Network Drive Multiplying to Create Duplicates all the way to Z:

I know this is super old, but I just had a user have a similar problem. I was able to figure out the issue and show the user how to prevent this from happening.

The user had a mapped drive to a server share: \\servername\share = Z:\

For some weird reason throughout the day she would end up with a V:\, W:\, X:\, and Y:\ (and sometimes more) along with the Z:\.

After troubleshooting, trying to recreate the issue I figured out she had about 6 shortcuts to shares for other folders on the server, under the \\servername\share directory.

I clicked on them all and opened them, one gave me a cannot open/find the share type of message. I then checked Computer and there was a Y:\ drive. I disconnected and tried to open the broken share. Sure enough every time I double-clicked on the broken shared folder shortcut I would get the error and a new mapped drive letter to same location as Z:\. Even right-clicking on the share, without selecting any option will create a new Mapped drive letter to the same location as the original Z:\.

I know this is an old question but, I was recently having a similar problem. Windows attempts to "repair" network mapping during resolution on NT systems. If the user has a link, that refers to the shared folder/program/etc. mapped to a different drive letter, it will map a new share and create an additional mapped drive. Find the incorrect link and it should resolve the issue.