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ADC3660: ramp usage.

Part Number: ADC3660

So I am able to read and write registers and configured the ADC3660 to output my real 16bit data in SDR one-wire mode.

Everything looked like it was working fine.
I could turn on the ramp and capture it. adjust the ramp and see it change.

I could switch to custom and flip single bits on and off and see it and capture it.

And then I could switch back to data and see some noise.

Until today.

Now as I write to register 16 it appears to go into custom mode with all zeros and then it is stuck.

Reading registers 14 15 and 16 all give me 5C.

I try to write to these registers, but they still return 5C.  

I can run my init script which resets the registers and I am back to data in and I see some noise.

14 15 and 16 all return 00.

I write a 01 to register 14 and it returns 5C, 15 and 16 are still 00

I write a 01 to register 15 and it returns 5C , 16 is still 00

I write a 48 to register 16 and it returns 5C.

Now they are all 5C and I can't change it other than resetting it.

What happened?