Since the upgrade to GCM 4.15.1 (Android phones) I've now noticed on multiple occasions that if we make an extended stop (30 minutes or more, say) during a ride, when I look at the Livetrack output when we finally get home, it only shows the track from where we resumed the ride after the stop. This happens for both my wife (Edge 1000, Sony XZ2 compact phone) and myself (Edge 1030, Google Pixel 2 phone). Both phones are running GCM 4.15.1. Both Edge units have auto sleep disabled, so that they don't power down during the stop, and they don't lose connection with the phones, which remain mounted on the handlebars next to the Edge units. This used not to be a problem - when I first purchased the Edge 1030 about a year ago, I could make a lunch stop during a long ride and Livetrack was not affected in this manner. The problem doesn't happen if we make a shorter stop - say 10 minutes or so.
Here's a screenshot of the Livetrack map from this morning's ride - nothing prior to our morning tea stop at the 66km point appears. Both the Edge 1000 and 1030 Livetrack have this problem - both units indicated that Livetrack commenced when we commenced the activity at kilometre zero.
https://photos.app.goo.gl/a4e4jXanHZtdoTaB9