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ADV7179 out put Video slowly When power on?


         ADV7179  out put PAL  VIDEO more than 30S, When  power on  .I  use FPGA trans VIdeo data to ADV7179.    IF  power on, FPGA trans video  data to ADV7179 immediately,  But  ADV7179  out put normal picture more then 30 seconds,Test found output blanking signal after config done,When  Temperature rise  after  a period of time,ADV7179 out put normal picture.

My schematic reference Technical Manual, Register configuration from Table 24. PAL B/D/G/H/I (FSC = 4.43361875 MHz) of datasheet, Why is this phenomenon?