DAC5672 behaviour at 245 msps

Hi,

   I am using DAC5672 Chip (275msps DAC, 14 bit). My customized daughter card consists of two DAC5672 chips on it. Each chip has two channels.  Initially, I was using this card at the 122.88msps rate. that time It was working fine. Now I am upgrading this to 245.76msps. Here I am facing one issue that signal is distorting at DAC output.

Do I need to take any precautions at this sample rate?

I am unable to get to know where the issue is that is software or Hardware?

I attached the Document which has DAC outputs at different sample rates.

Please respond to my query ASAP.

Thank you in Advance.

Anonymous