Mapped drive duplicating in windows 8.1

I upgraded to Windows 8.1 a little while ago and have run Windows Update recently.  For the most part, things seem to be working fine. 
One issue that I have noticed is that one of my mapped drives keeps duplicating.  This seems to happen after every restart, or shutdown.
I have Hyper-V set up and I mapped drive T:\ to a folder on that drive.  It has been working fine for a year.
After getting the latest update for Windows 8.1, when I go into File Explorer, I will see that drive listed as all other available drive letters as well as drive T:\.
I can disconnect them, but it is a pain to have to do that over and over - I cannot map other drive letters to other folders if they are in use.  I need to do that periodically for testing client issues.
I have searched the forums and did not find any open threads for this.
It is a standalone workstation that is networked with other computers but it is not on a domain.  This is the only other computer I use all the time that has Windows 8.1 installed.
Please help.

Hi,
You can try clean boot to determine if a 3rd party software causes this issue.
If this is not the cause, I suggest you modify the registry value of mapped drivers to see if this issue persists:
HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion \ Explorer \ Map Network Drive MRU then delete the duplicated drive path.
If this issue persists, please try another user account for test.
Regards,
Yolanda
Yolanda
TechNet Community Support
No 3rd party software is causing the issue.
I went to
HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion \ Explorer \ Map Network Drive and there is only the default, nothing else.
There are no other user accounts on this machine.
mjmart61

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