3 years ago I have this problem :
How I am working?
1) I record a song using styles and the RECORD function of the SD1.
2) I copy the .mid file created to my PC
3) I open it with SONAR, and make editing, playing others tracks...
The problem is sometime (aprox after 15 min of work, start, stop, record...) the SD1 stay with sound and must be restarted (no reponse of the keyboard)!
I had 2 SD1, and all are doing this
1 have all versions of sonar, and all are douing this...