I've used iTunes for years and everything was ok. Out of the blue, about one month ago, it started skipping newly imported songs at 1:35. (the problem is the same on the new app that replaced iTunes, Music).
Not every song, but many of them.
The mp3s are ok: they have the correct duration (if I play them in preview mode from the desktop they play until the end).
If I copy the mp3 on my iPod Classic, they are copied until 1:35.
On other mp3s, the duration of the song is longer than the correct one and the ending is filled with a repetition of the ending part of the song. Even if I copy them on my iPod, they have the same problem. But the mp3 files are ok, they don't have the "double" ending.