Part of one track missing

Hi 

I have something similar, I have sent Tracks to the an etrex 25, the end of the Tracks is missing, If I open the tracks with gpx viewer or gpx trackmaker the track is there in full. I have deleted the file (its on a sd card) resent it with BaseCamp, the end of the track is gone again. Really weird behaviour. I have tried this several times. i  have no Idea why it picks a certain point to stop the track.