Audio Cannot Playback when out of range

When i convert my favorite mp3 song to wav…
and i import it into UE4… place it… set attenuation… and Play…
It work…
but then when i go outside of range, it will off, this is normal… okay
but when i go inside the range again… my song cannot play anymore, still no sound…
Why ??

which it Fire sound from UE4 could do this, when i out of range and come back to range, it will play again…