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AD7124 reply error data

Product Number: AD7124

Hi, I am using AD7124-8 under about 18KHz sclk. Firstly, I reset the device with 64 1s in DIN (shown in fig. 1). However, when I tried to read some registers, they sometimes reply error data (fig. 2, that is ID register, and DOUT is chaning between 0 and 1), but sometimes correct. When I read status register, it can replys 0x90 sometimes, and the POR_FLAG is 1. So I wonder whether it means the device fails to reset and is not synchronous in serial port? How can I check or correct it?

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