Sometimes when waking from deep sleep while using the external Drastic NDS emulator, the system freezes — no inputs or music, and only a hard reset (or sometimes the reset button) works.
The issue is inconsistent: sometimes it happens after 10 minutes of sleep, sometimes overnight it works fine.
Tapping the power button still toggles sleep correctly even after the freeze.
It might be related to how the emulator handles suspend/resume (I'm using kill -STOP and kill -CONT around sleep).