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AD7763 Eval Board Noise

When I power up the eval board with an analog front end I've designed, after about 10 seconds the Std.Dev figure jumps from around 1000 counts up to 5000 counts.

Is there something about the AD7763 eval board and the CED1Z that could be causing this?

What kind of questions can I answer that would help me figure this out?

Without a front end attached and the ADC inputs terminated on the eval board that Std. Dev figure is down around 85 counts.  I realize that my front end will add Std. Dev counts.  What is frustrating is the jump after 10 seconds.  I would love to get rid of that.