int. 888 (fax service) is going down after 10-20 days

[Theodore]

Hi,

I have 3CX 10 sp6 and I have an annoying issue.
Every 10 or 20 days I have to restart my server because the internal number 888 goes down.
Restart of the fax service is not helping.
Actualy it returns with an error:

"An exception occured RestartServices Error : Cannot stop 3CXFAXSrv on computer '.'."

The system is SBS 2011.

Does anyone knows anything about this error?

Any help is appreciated!