iMac keeps changing identity adding a number (x) behind byname-iMac

My iMac's computer name keeps changing automatically after

Yosemite upgrade

This started happening once I upgraded my iMac to Yosemite. It will add numbers to the name of my

iMac.

Example: It starts off as say "My iMac"

Then a half day later, it changes to "My iMac (2)"

Then the next day it will be "My iMac (3)"

And if I open the Finder window, it will show "My iMac" and "My iMac (2)" under "Shared" but if you click

on them, nothing happens.

When I go to System Preferences > Sharing the computer name will have the number there "My iMac (3)"

and say it can be found as MyiMac-3.local

If I change it back to just "My iMac", the number process starts all over again. I even tried naming the

iMac something it was never named before and the same process occurs with the adding of the numbers.

Anyone know how I can fix this?