I have a 920XT and an iPhone 6+. Firmware and iOS app are up to date with latest versions as of 10/25/2015. I have verified that cellular data connection is good and enabled for Garmin Connect.
I am now seeing Livetrack connect and properly start activities, then it always drops the connection a few minutes into the activity. From the phone and the watch, everything appears fine--bluetooth connection is good, phone cellular connection is good. But Livetrack recipients see various problems ("trying to reconnect" or some such) that mean they see only a few minutes of activity then the activity never updates again. Also, when I end the activity on the watch, there is no communication to the iOS GCM app even though bluetooth is connected and the data from the activity is immediately uploaded to the app, to Garmin Connect and to Strava. This failure appears very specific to Livetrack and must have something to do with the connection to the Livetrack servers.
Over the past year I have had numerous Livetrack issues, but with the latest updates, the feature is now essentially useless.
In looking at the forums, it seems lots of people have these issues, but there is little effective response to them.
Anyone have any insight?