Why does the local network and computer name keep changing?

After upgrading to Yosemit the local network name and computername on my iMAC keep changes link:
Mycomputer-1
Mycomputer-2
Mycomputer-3
Why?
I have tried to change it back in sharing and network locations.
Is this also the reason the my iPhone cannot find my iPhone often cannot find my iMac when I will sync it? Then I have to restart the iPhone and iTunes on the computer. This happens very very often.
Maybe it also linked to these errors which the log is full of - many every minute:
19/10/14 12.11.09,522 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:256
19/10/14 12.11.09,543 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:12856
19/10/14 12.11.09,561 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:0
19/10/14 12.11.09,565 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:44032
I think the is some bug/clash between bonjour and other network protocols. That is only a guess.

After resetting the computer name and local host name to the correct name without the number I also shotdown my iMac, my AppleTV, my iPhone, my iPad and then rebooted my Airport/Time capsule it seemed to work at least for several days. But yesterday I discovered that my Apple TV now also has changed name to Apple TV (2).
I logged into iCloud.com to see my devices and here it was really wired. My Apple TV was called Apple TV (2) and my iMac also had (2) after the name. Then I checked it on the iMac but here it was correct! Why can it have one name on the iCloud and another on the computer.
I restarted both the iMac, Apple TV and Airport Time capsule then everything was correct also on iCloud.com.
But today the iMac was called the name (2) again on the iMac. And now the local host name also had -2 after the name. It has not always been both names that has changed. That is really wired. And today Wifi was not working on the iMac after wake from sleep. I changed the name back and rebooted again also the Airport Time capsule. Now it is working again.
The log is still full of this messages:
02/11/14 19.22.13,186 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:1901
02/11/14 19.22.25,738 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:34051
02/11/14 19.22.25,758 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:12342
02/11/14 19.22.25,900 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:34051
02/11/14 19.22.25,919 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:1901
02/11/14 19.22.27,636 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:28772
02/11/14 19.22.27,683 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:27693
02/11/14 19.22.27,714 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:28533
02/11/14 19.22.49,833 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:29281
02/11/14 19.22.49,866 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:28528
The name is not the only problem. Often itunes will not find my iPhone and iPad. Then i need to close iTunes and restart the iPhone and iPad then it works for some time.
And the iPhone and AppleTV will not always wake the iMac from sleep. I am wondering if the is linked to the changing of name.
I have seen by googling that it can be related to a sleep proxy problem so it seems like that here is two devices on the net with the same name that is why name is changing, but to know this do not help me to solve the problem. I have also seen all the suggestion to turn almost every services off on the computer, but again I it is not a solution and I have the iMac and devises to use the functionality not to shot everything down. So I do not really understand people saying turn off itunes, turn off blueboth, and turn off this and that.
Apple must soon come with a real solution. We are really many people have these problem since we upgraded to Yosemite and iOS 8.
I have also listed some of the iTunes errors from the log below:
02/11/14 19.24.48,160 com.apple.xpc.launchd[1]: (com.apple.quicklook[1364]) Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.quicklook
02/11/14 19.24.52,279 Console[1368]: Failed to connect (_consoleX) outlet from (NSApplication) to (ConsoleX): missing setter or instance variable
02/11/14 19.25.06,907 iTunes[480]: Entered:_AMMuxedDeviceDisconnected, mux-device:5
02/11/14 19.25.06,908 iTunes[480]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:5
02/11/14 19.25.06,908 iTunes[480]: tid:17d8b - Mux ID not found in mapping dictionary
02/11/14 19.25.06,908 iTunes[480]: tid:17d8b - Can't handle disconnect with invalid ecid
02/11/14 19.30.19,234 com.apple.usbmuxd[56]: _SendAttachNotification Device 30:f7:c5:30:b8:2b@fe80::32f7:c5ff:fe30:b82b._apple-mobdev2._tcp.local. has already appeared on interface 5. Suppressing duplicate attach notification.
02/11/14 19.30.22,192 soagent[429]: Can't allocate SOHelper <SOMessageHelper: 0x7f9053a102c0> inside com.apple.soagent
02/11/14 19.30.54,871 iTunes[480]: Entered:_AMMuxedDeviceDisconnected, mux-device:6
02/11/14 19.30.54,871 iTunes[480]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:6
02/11/14 19.30.54,871 iTunes[480]: tid:1a23b - Mux ID not found in mapping dictionary
02/11/14 19.30.54,871 iTunes[480]: tid:1a23b - Can't handle disconnect with invalid ecid
02/11/14 19.32.06,137 com.apple.usbmuxd[56]: _SendAttachNotification Device 30:f7:c5:30:b8:2b@fe80::32f7:c5ff:fe30:b82b._apple-mobdev2._tcp.local. has already appeared on interface 5. Suppressing duplicate attach notification.

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