NTPD consuming lots of CPU

[kandalf]

I have a server with Centos 6.5 and from about 2 week ago almost everyday my server have a NTPD service hanging around consuming about 98% of CPU.

When I do a htop this is the service that is consuming my CPU

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ntpd -u ntp:ntp -p /var/run/ntpd.pid -g

If I do a

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service ntpd restart

it start working corretly but in the next day the problem appear again.
Any ideas how to solve this issue?