Using aplay to play a sound file (but this is not restricted to aplay).
i.e. aplay test.wav &
if you play another one before the first one has finished, the sound system appears to crash once the first sound finishes. No errors are appearing in syslog.
I don't believe this happens with recent firmware. Can you test?
@popcornmix there have been no response in 2 years, so I guess that this can be closed.