RPC Services on SBS 2011

Hi,

We currently have an SBS 2011 server, which on a frequent basis, the RPC Endpoint Mapper and Remote Procedure Call services terminate unexpectedly.

I've checked through the event logs and there's nothing logged other than errors notifying the services terminated unexepectedly.

This seems to happen once every couple of weeks. There doesn't appear to be a specific pattern as to when it occurs, it just happens spontaneously.

The server has to be rebooted for the services to start again.

Any ideas of where we can look to see where the problem is originating?

Thanks