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CC3235S: 冷启动后DCDC_PA_SW_P&DCDC_PA_SW_N 电压为0 ; VDD_PLL 电压为0,射频性能不良。

Part Number: CC3235S

产品做老化测试——开机3分钟,关机1分钟循环往复,冷启动发现发射功率下降到只有-50dbm,刷测试固件后发现输出功率-50dBm,接收-30dBm,测试电源域发现 

DCDC_PA_SW_P&DCDC_PA_SW_N 电压为0  
VDD_PLL 电压为0
数字部分电压都正常,也能正常通讯。
ABA测试发现,不良跟着芯片走。
造成芯片不良的原因可以通过哪些方面排查?