Baremetal Install Server rebooted as soon as I started the calls

I have installed 3.1.10 freesbc bare metal version on Dell-R610. I loaded the demo configuration and created the NAP and outbound route.
my test calls were completing fine. Inbound call would match on NAP_SIP and outbound call would match on NAP_OUTBOUND.

UAC–>freesbc -->UAS

When I dialed 100 calls with 30cps from UAC towards freesbc and freesbc rebooted.

How can I find out that what caused the server to reboot?

If you create a tbreport and send it to support@telcobridges.com, we can figure it out why FreeSBC rebooted in 30 cps.