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SK-AM62B-P1: Link detect of both ethernet port are not working after auto rebooting

Part Number: SK-AM62B-P1

Tool/software:

I started codesys demo soft on AM62 booted by micro SD card with tisdk-default-image-am62xx-evm.rootfs.wic.xz without install any other software.

dr-download.ti.com/.../tisdk-default-image-am62xx-evm.rootfs.wic.xz

CODESYS Control for Linux ARM SL | CODESYS Store International

The demo soft will auto reboot after 2 hours.

After the auto rebooting, link detect of both ethernet port are not working.

The light on both ethernet port are not flashing when the ethernet cable is inserted.

But when the AM62 is power on, the light on ethernet port will flash for a while.

Could this be a hardware malfunction? Or just a software problem?

I tried to remake the image in the micro SD card and reboot the AM62 multiple times and nothing changed.