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ADF4153A failure in power on-off test

Hello,

My customer is using ADF4153A as the following conditions:

    REF_IN: 10MHz / External_VCO: 608MHz / PFD_freq: 5MHz / CH spc.:500KHz

There is no problems in a normal state.

When the customer test the repeated power on-off, ADF4153A is occurred an irregular error that is locked about 4Mhz shift than the desired frequency.

  - The error is occurred regardless of the RF frequency.

  - If ADF4153A set a high RF frequency It is shifted more.

  - The error is cleared only when there is power-on reset of ADF4153

 

Please tell me the cause and solution of the error.

 

Thanks in advance.