How to stop the computer from changing its local network name when waking up from sleep mode

How do I prevent a mac mini from changing its' network name automatically when it wakes up from sleep mode... It will wake up and display a warning that the network name is already in use and it changes its name to (n+1) name with number after it... I know that there is no other device with that name because the only other things on the network are 2 hard drives (one being used for time capsule) and a printer..
This is very annoying and needs to be fixed.... don't tell me to make the computer never sleep because that defeats the power savings settings under power management.

Go to System Preferences>Network>AirPort and delete your network from the Preferred Networks box. Reenter your network information. Make sure that AirPort is the topmost listed interface when you Show Port Configurations. Apply the changes and Restart. Does it work now?

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