Hello Cisco Support

I have a question. My Cisco SPA112 V02 is rebooting every 2 minutes or less. I have tried to set NAT KEEP ALIVE ENABLE: to YES according to another block I seen. However it is not helping. It keeps rebooting but if i leave it for 50-55 minutes, It will become stable but it will happen as soon i reboot the device again.Please  help