Me too. I have laps set up on my Leikr at 1 mile. I noticed that all of the affected runs the tracking stops dead on a specific number of miles, so for example a run which was 6.8 miles the tracking stops at 6 miles, a run which was 3.5 miles the tracking stops at 3 miles. So I wonder if it is something to do with the laps functionality??
The fault does not show up on Strava. If I export the run from Strava and import into Endomondo the run is unaffected.