[Freeswitch-dev] Silence in conference recording

Hi, I use the recording functionality of mod_conference to record conference calls. The recording is save to a .wav file. Now for the second time in a few months I experienced something strange. The recording goes silent after 15 minutes of recording. But the recording is not stopped. There is nothing strange found in logging. And other recordings are not having this issue. Is there anyone who knows anything about this and how to fix or prevent this. Thanks. Miguelo