I have been having so many troubles with network bugs in Yosemite but this one is really irritating me. I have two MacBook Airs (2010 and 2011) and 4 Mac Minis. I use the current AirPort Time Capsule as my primary DHCP router and have two AirPort Expresses. So I am 100% Apple in networking. The Macbook Airs (Not the Minis for some reason) keep resetting the Computer Name every few hours or so. I think it might be when they sleep (possibly). This has never happened before in 10.9, 8 etc I reset the name at say "MBA" then it gets renamed to MBA (2), then MBA (3) etc etc. I have googled this and tried a number of suggestions that do not work. I have tried: - rebooting Airport Time Capsule and Macs (multiple times) - Powering them off completely for a few minutes - Setting WiFi (their primary network connection) as #1 in the Service Order - Setting a specific 'Location' in the network tab - Renaming the MBAs So I have tried every thing I can find and nothing has worked. Any suggestions would be greatly appreciated.