We've used TeamCity for about a year now, and have had Mac/iOS build as part of our build chain for about 7 months.
Recently (sometime around the release of version 7) we're starting see cases where our xcode builds have failed, and the machine detaches itself from the server.
Upon logging into the mac, we note that the Finder and Dock applications are unresponsive.
Checking top suggests that it fluctuates between a running and stalled state.
Have you heard any other reports similar to this?
I can potentially provide logs of these issues, although it's hard to tell exactly when things fail, as it's usually on our overnight builds.