Multiple versions of same computer listed under shared (with a number added)

Hi,
This is not Yosemite specific as  I found numerous posts from earlier systems but no solution. I have 4 macs connected to this specific network. For whatever reason after running for months with no issue the iMac is now listed multiple times and a number is added. The previous computers do not work (as shortcuts). When reading up on  the problem, this should only happen if there are numerous macs with the same name on the same network. This is not the case the name listed under system prefs -> Sharing is unique. I tried to delete the extra number and restart the system but it never seems to stick. Looking into the Bonjour network I can find these same references. I assume the iMac thinks there is another computer with the same name and thus adds another system. This also carries over to the other computers as it lists the imac multiple times. Does anyone know how to solve this problem? Can I delete the bonjour/apple file protocol prefs and as such delete all the systems?
I have turned smb/afp on/off I have renamed the system, restarted it and then going back to the old name to no avail.
Thanks for any ideas,
Philly

There are several possible causes for this behavior.
1. Two (or more) computers on the local network have the same Bonjour name, such as "X's-MacBook-Pro.local". Resolve the name conflict by renaming one or more of them in the Sharing preference pane.
2. You have two simultaneous connections to the same local network: probably Ethernet and Wi-Fi. If applicable, disconnect the Ethernet cable or turn off Wi-Fi.
3. A Mac wakes from sleep due to network traffic. This is a bug in OS X that may only affect some models.
4. A device that gets its network address from the router wakes from sleep, and the address it was using before has been assigned to another device.
5. A third-party wireless router has incompatible settings or firmware. In that case, refer to the manufacturer or ISP for support. Restarting the router may help, temporarily.
6. If the router is an Apple device, it may need to be restarted.
7. A third-party Bonjour device on the network is malfunctioning. Finding out which is a process of elimination.
8. There is more than one DHCP server on the network. Typically, there would be two or more wireless access points configured to act as routers.
9. See also this support article.

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