Tracks Keep skipping halfway through on my Apple music / itunes Library

For the past month most of the tracks i've added to my library will skip to the next track halfway through playback.

This is extremely frustrating as the entire track is there, if you scan using the cursor it will play to the end.. but if you just play the track as per normal it will get a minute or so into the track and then just skip to the next track.

Has anyone else experienced this problem ? It's driving me crazy and I don't know how to stop this from happening.

Any help is greatly appreciated .. P.S this only happens with playback on my Imac

Anth