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AM5716: AM5716 inconsistency of bootup

Part Number: AM5716

Dear sir/madam,

We have a customized PCB using AM5716, which is having problems during bootup.

When the PCB is powered on, there is 10% chance to fail bootup, with other 90% chance to work properly.

When the PCB failed bootup, the system external clock could be detected, all power supply are ok, RESETn and RSTOUTn signal are ok. The CPU is not responding.

IF the debugging USB port is connected, this failure is not going to happen.

What is the possible cause of this failure, and how shall we start to troubleshoot.

REgards,