Bug Report: Audio Signal breaks off, chopped, muted, not playing, stop, cut

This behaviour happens very seldom and by chance, so I had this once with a Space Designer Reverb and now it's happening with a Softsynth. Please listen to this short mp3:
http://www.diedacon.de/piano_cut.mp3
The first piano exactly plays how it is intended: Over the complete length. now i copy this midi block in the arrange window behind it. and another piece again behind the next one. the last two ones play shorter though it is the same lenght!
keep in mind: no automation, any sent midi data commands or sysex behaviour, no overlapping (midi data length is set manually shorter than it's "shell") of audio or midi data is interfering to create this "phenomenon".
For the example of the Space Designer Reverb: Imagine an Audio signal flowing through a Space Designer, which creates a tail of reverb. Now think of the audio signal on this channel completely dissappearing for 1 second at the middle part - it seems, if someone just has chopped some piece out of the audio signal: the reverb continues with it's natural fade out to the end.
same "keep in mind" criteria for the space designer.
Anyone else experiancing "audio cutting", "muting" or "stopping midi data"? This is definately some kind of strange bug.
Mac OS X (10.3.8)
Mac OS X (10.3.8)
Mac OS X (10.3.8)

Well, unless you're using Steinberg 'The Grand' as your softsynth piano it's probably no bug but sth else. Does it happen in solo mode, too ?
( For troubleshooting, it always makes sense to list your audio equipment / drivers and your macs specs in your profile; or at least within your posting, so people have the chance to be helpful. In short : more details, please ... )

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Oracle APEX Essentials: [http://essentials.oracleapex.info/]
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Bug Report: Audio Signal breaks off, chopped, muted, not playing, stop, cut

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