Why RHEV Hypervisor regenerates SSH Key ?

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Issue

When logged in to RHEV hypervisor using ssh it accepts the key and login is successful.
However, after rebooting the host cannot ssh, it throws below error message.

login denied, RSA host key has changed

Environment

Red Hat Enterprise Virtualization 3.1
RHEV Hypervisor - 6.3 - 20130129.0.el6_3

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