This may not have anything to do with it but have you Disabled Windows from Managing Your Printers?
I was not sure what WSD is and my Google search found this on a MS site about users ports getting changed
"We’re running into this same issue. What registry entry need to be changed to keep it from swapping to WSD from static TCP/IP? This is getting really old.
If you can’t stop the printer advertising WSD, then I would try removing the following registry key and restarting Print Spooler. This will disable the WSD Port Monitor.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print\Monitors\WSD Port"
Note: Use at your own Risk......