Loud Static at the end of Voicemail Playback (WAV)

Hi All,
I’ve got problem with voicemail playback as stated in Subject. At the end of Voicemail Playback i hear very loud static noise (about 1 sec) . It only occures when voicemail is stored as .WAV (wav49 and gsm are ok). Recordings are ok (when I play them with some player - everything is ok).
Im using Asterisk 1.2.14 with Zaptel-1.2 on Debian 4 (kernel 2.6.18-4-486) and I store messages in MySQL DB.

I was wondering if this problem was common with this version of * or is it just my case.

Thx in advance:)