[BIG BAD BUG] corrupt audio

ok so originally i had a piano (with string ensemble) piece that i created in Notion 3. I upgraded to Notion 4 and then transferred the piece over to Notion for ipad. Around bar 10 into the piece the audio started to crackle and just escalate in crackling noise and corruption until stopping the playback. This would happen again and again at the same point every time when restarting from the beginning. I thought that it was the conversion process so i decided to create the piece from scratch......
It still occurs even with just the piano on its own.....about the piece:
tempo = 85 crotchet beats per minute
time signature = 6/8
key signature = C Major
treble clef = simple singing melody
bass clef = filled with semi-quavers
length = 10 bars so far
dynamics = pp in bass clef, mf in treble clef
other = damper pedal used in bass clef
I guess I have to revert back to Notion 4
cheers
It still occurs even with just the piano on its own.....about the piece:
tempo = 85 crotchet beats per minute
time signature = 6/8
key signature = C Major
treble clef = simple singing melody
bass clef = filled with semi-quavers
length = 10 bars so far
dynamics = pp in bass clef, mf in treble clef
other = damper pedal used in bass clef
I guess I have to revert back to Notion 4

cheers