The auto pause is set to go on after 90 minutes, don't think that was the problem but it didn't happen today so perhaps it was user error of some sort.
I transferred (5) albums today and 2 of the albums had no problems whatsoever, the others had varying tracks ending up in the 'unknown artist' folder. One album had tracks (1) and (7) missing, another (4) tracks missing - (2), (6), (7), and (8) and another just had track (6) missing.
The missing tracks end up in the 'unknown artist' folder with the number of the track and the name of the track in the 'name of the track' heading, i.e., 2. Ramblin' Man - no artist, no album, no year and no track number where the track number is supposed to be. What seems odd is that the problem seems to be both intermittent and random.