Hi,
Another customer reported the same problem these days. We are investigating about it.
Just to better understand the problem:
1. What's your asterisk version?
2. Coud you replicate the problem?
3. Is it related always on a single server or it could happens randomically on different servers in the cluster?
4. Can you send us the CLI output and the catalina.out file when this happens?
Thank you and regards,
Marco Signorini.