Hello Mahesh,
it is difficult to say:
the two processors need to talk correctly and in a timely manner.
You should examine the log buffer of the device and on the syslog server (if configured)
look for messages related to OOB out of band management and to root processors containing the RP code.
The master processor may order to the slave to reboot it it thinks the other one is not answering correctly and a timely manner.
Hope to help
Giuseppe
