My host name changes every few days, since Xmas adding a macbook its changed 6 times. Do I need to stop this? Does it cause problems with sharing between the iMac and macbook?

my host name changes every few days, since Xmas adding a macbook its changed 6 times. Do I need to stop this? Does it cause problems with sharing between the iMac and macbook?

There are several possible causes for this problem.
1. Two (or more) computers on the local network have the same Bonjour name, such as "X's-MacBook-Pro.local".
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 due to 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. See also this support article.
Rename the computer in the Sharing preference pane.

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    com.apple.iokit.IOPCIFamily 2.6
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