After reboot, /ip dns changes revert to old settings

Hi all,

I have a strange problem with /ip dns.

I need to update the name of the DNS server server in routerboard, and so use /ip dns to change the settings. I can view the new settings, and the routerboard's DNS now works, so far so good.

I then reboot the routerboard, and the old dns settings have come back again, the change I made didn't "stick".

Is this a known problem, and has anyone worked around it / managed to solve it?

Regards,
Graham

are you using dhcp client with use dns checked?