sonar 3: noise in tracks after mixdown/mastering

[milchstrasse]

hi there!
i use cakewalk sonar 3 producer edition. my problem:
after the mixdown there is short noise in the final track. it's only a few seconds long but it's disturbing.

does anybody have the same problem?

[milchstrasse]

here's an example:

http://www.panjapol.com/fort.mp3

...at the beginning[/url]

[milchstrasse]

here's an example:

http://www.panjapol.com/fort.mp3

...at the beginning