Split audio issues: freezing/buzzing during playback


I have downloaded Audacity to help teach one of my students how to trim and edit audio files. We have split the tracks where needed, but as soon as playback reaches the end of the first clip, it stops playing and just buzzes. If I drag the cursor into the second part of the split, it continues playback fine.
I have tried joining the two split parts together, but it still stops and buzzes at the same place… any advice would be greatly appreciated!

Many thanks

Do you think uploading a video illustrating the issue would be helpful ?