Discontinuous midi playing problem

Recently I am developing a game on Motorola V980. A sound playing problem has occurred in my working progress. That is when I continuously play two Midis, first one worked fine, but second one was played discontinuously. However, when I played the second MIDI independently, such problem did not occur.
Detail logic of my program were organized like this:
1) Open a binary file and stream it
2) Copy streams into local buffer, such as byte arrays
3) Create Player object for each sound and organize them in an array
4) Invoke Start, Stop, ... methods according to my game logic
5) Finally, a level was completed, stop and destroy Player objects and recycle memory allocated.
I am wondering if it is a bug of sound system of Motorola V980. So I looked for solution in relative Motorola official specifications, media guides and many J2ME developer forums. Unfortunitely nothing I have got. Anyone kindly give me some advices on this issue would be greately appreciated.

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Discontinuous midi playing problem

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