about LTM4633 and LTM4602

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Two questions:

1、About LTM4633

     Only set one channel run, each channel power is OK. But set three channel run simultaneously, only Vout1 (MGTAVCC_1V) is OK, the other two Vouts are wrong. And the chipset(LTM4633) became very hot. What about the reason?

 2、About LTM4620

     When power on(+12V), the chipset(LTM4620) would take long time(about tens of seconds) to work stable, and the output voltage would oscillate. The highest output voltage would reach 2.2V, and the lowest output voltage would reach 0.6V. What is wrong with my circuits?

Thanks lot