Hi Bucobil,
We had this in the past and lost SOOOO much work, until we fgured out it was a memory issue. Once we increase the Configurator Memory Allocation it stopped. Never lost work again. This usually starts to happen when your BSV becomes quite large.
So try to increase your memory settings and see if that resolves the problem. I suggest the following:
AwareIM Server: 1200 mb
Tomcat: 768 mb
Configurator: 768 mb
This is the setting we've been using for the last year or so. 🙂