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TDA4VM: TDA4 reboot after ran a while

Part Number: TDA4VM

Hi Dear Experts :

As title description, our customize board reboot after ran a while.

Same firmware (u-boot+linux)  works fine on EVB board, but reboot on our customize board .

we measure CPU die temperature about 45 degree with fan, so it should be not over heating issue.

when board works in u-boot prompt only, board reboot after ran a while. (15 minute)

when board works in linux system, board reboot after ran a while too. (15 minute)

we try to dump log message in linux, but log disappear when system reboots.

my problems is :

1. Is any debug direction(suggestion) for this issue ?

2. Is any way to dump(remain) error log when system reboot?

Many Thanks