Game sounds only play during first PIE editor session for Linux project

Games sounds will play as appropriate during first PIE session but subsequent PIE sessions have no sound until editor is closed / reopened.

1. Open UE4Editor (first person template)
2. PIE (sound for starting PIE does not play)
3. LMB to fire (note firing sound does play)
4. Press escape to exit pie (sound for ending PIE plays)
5. Repeat steps 2 & 3

Result:
second time entering PIE has no sounds plays

[4.8] Sound on Linux works only once