Is the rest of your infrastructure on a UPS ? i.e. If your interface that the RRAS is utilising ends up being disconnected because the switch/router has powered off, could this not cause the issue ?
Also we had some issues with the UPS Software slowing down our server (100% CPU utilisation), this was caused because the version of the UPS Software from APC utilised a certificate and the certificate expired. We had to install the latest version to get around this one, this could also be an avenue worth persuing also.