Hi,
When playing an audio clip via an animation blueprint (Animation - > Notifies → Add Notify → PlaySound); after a short period of it working as expected (maybe 10 - 100 triggers), the audio file stops getting fired. The only way to get it functioning again is by restarting the editor.
I seem to only experience this with some audio files, all of which meet the file requirements (16 bit, stereo, .wav), I have reproduced this using some of the example content audio files too, such as the assault rifle gun shots from Shooter Game.
I have experienced this issue on v4.4.0 and v4.4.1 of the editor (download version)