I'm syncing two folders between a Mac mini and an iMac, both running OS X Mavericks. The same two folders are also syncing to a VPS. Recently I noticed a cloud icon next to the iMac syncs in the devices list, indicating that a relay server was being used for those syncs. At the time both machines were running 1.3.94. Restarting BTSync fixes the problem, but eventually it reappears. On a hunch, last week I disabled the use of relay server for one of the two folders. Both machines are now running 1.3.106, and just today I noticed the cloud icon next to the iMac for the folder that's allowed to use a relay server. The other folder has no cloud icon. I have a feeling this may be related to one or other machine going to sleep. I would like to be able to allow all devices to use a relay server when necessary, but for now I feel compelled to turn off that option to prevent unnecessary use of a relay server.