Thank you for your answer. I have attached photos of the Ethernet port abnormality in post # 17. Is there any way to solve this problem？
System logs may be helpful for analyzing issues：
Apr 10 07:18:19 LogicMachine kern.info kernel: [ 406.219346] fec 2188000.ethernet eth0: Link is Up - 10Mbps/Full - flow control rx/tx
Apr 10 07:18:17 LogicMachine kern.info kernel: [ 404.203263] fec 2188000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
Apr 10 07:18:16 LogicMachine kern.info kernel: [ 403.202974] fec 2188000.ethernet eth0: Link is Down
Apr 10 07:18:12 LogicMachine kern.info kernel: [ 399.154910] fec 2188000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
Apr 10 07:18:09 LogicMachine kern.info kernel: [ 396.122472] fec 2188000.ethernet eth0: Link is Down
Apr 10 07:18:07 LogicMachine kern.info kernel: [ 394.090543] fec 2188000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
Apr 10 07:18:05 LogicMachine kern.info kernel: [ 392.074183] fec 2188000.ethernet eth0: Link is Down
Apr 10 07:11:59 LogicMachine kern.notice kernel: [ 25.085470] random: nonblocking pool is initialized
Apr 10 07:11:51 LogicMachine kern.info kernel: [ 17.552836] fec 2188000.ethernet eth0: Link is Up - 10Mbps/Full - flow control rx/tx
Apr 10 07:11:48 LogicMachine kern.info kernel: [ 14.520618] fec 2188000.ethernet eth0: Link is Down
Apr 10 07:11:44 LogicMachine kern.info kernel: [ 10.472851] fec 2188000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
Apr 10 07:11:43 LogicMachine kern.info kernel: [ 9.472610] fec 2188000.ethernet eth0: Link is Down
Apr 10 07:11:39 LogicMachine kern.info kernel: [ 5.424837] fec 2188000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
Apr 10 07:11:37 LogicMachine user.info sysinit: /lib/genohm-scada/storage/db/current.db: OK
Apr 10 07:11:36 LogicMachine kern.info kernel: [ 2.539053] EXT4-fs (mmcblk0p3): mounted filesystem with ordered data mode. Opts: nodelalloc
Apr 10 07:11:36 LogicMachine user.info sysinit: /dev/mmcblk0p3: clean, 586/38400 files, 15267/153600 blocks
Apr 10 07:11:36 LogicMachine user.info sysinit: e2fsck 1.45.6 (20-Mar-2020)
Apr 10 07:11:36 LogicMachine kern.info kernel: [ 2.410687] fec 2188000.ethernet eth0: Freescale FEC PHY driver [SMSC LAN8710/LAN8720] (mii_bus:phy_addr=2188000.ethernet-1:00, irq=-1)
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 1.341007] fec 2188000.ethernet eth0: Freescale FEC PHY driver [SMSC LAN8710/LAN8720] (mii_bus:phy_addr=2188000.ethernet-1:00, irq=-1)
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.914990] EXT4-fs (mmcblk0p2): re-mounted. Opts: nodelalloc
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.509328] Freeing unused kernel memory: 164K
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.509057] VFS: Mounted root (ext3 filesystem) on device 179:2.
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.508968] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.428669] mmcblk0: p1 p2 p3
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.427090] mmcblk0: mmc0:b370 CBADS 7.48 GiB
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.426303] mmc0: new high speed SDHC card at address b370
Apr 10 07:11:35 LogicMachine kern.warn kernel: [ 0.420241] mmc0: host does not support reading read-only switch, assuming write-enable
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.388753] Waiting for root device /dev/mmcblk0p2...
Apr 10 07:11:35 LogicMachine kern.err kernel: [ 0.388681] Warning: unable to open an initial console.
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.388265] vdd3p0: disabling
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.387688] rtc-pcf85263a 0-0051: setting system clock to 2023-04-10 07:11:34 UTC (1681110694)
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.382265] can: raw protocol (rev 20120528)
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.382211] NET: Registered protocol family 29
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.382044] can: controller area network core (rev 20120528 abi 9)
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.382001] NET: Registered protocol family 17
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.381874] ip_tables: © 2000-2006 Netfilter Core Team
Apr 10 07:11:35 LogicMachine kern.warn kernel: [ 0.363169] 2198000.adc supply vref not found, using dummy regulator
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.348549] mmc0: SDHCI controller on 2194000.usdhc [2194000.usdhc] using ADMA
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.310675] sdhci-esdhc-imx 2194000.usdhc: No vqmmc regulator found
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.310632] sdhci-esdhc-imx 2194000.usdhc: No vmmc regulator found
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.308166] sdhci-pltfm: SDHCI platform and OF driver helper
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.308150] sdhci: Copyright© Pierre Ossman
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.308123] sdhci: Secure Digital Host Controller Interface driver
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.307204] usbcore: registered new interface driver btusb
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.306376] imx2-wdt 20bc000.wdog: timeout 60 sec (nowayout=0)
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.305222] lirc_dev: IR Remote Control driver registered, major 249
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.304347] i2c /dev entries driver
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.304077] rtc-pcf85263a 0-0051: rtc core: registered rtc-pcf85263a as rtc0
Apr 10 07:11:35 LogicMachine kern.warn kernel: [ 0.300385] rtc-ds1307: probe of 0-006f failed with error -5
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.298459] hub 2-0:1.0: 1 port detected
System logs may be helpful for analyzing issues：
Apr 10 07:18:19 LogicMachine kern.info kernel: [ 406.219346] fec 2188000.ethernet eth0: Link is Up - 10Mbps/Full - flow control rx/tx
Apr 10 07:18:17 LogicMachine kern.info kernel: [ 404.203263] fec 2188000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
Apr 10 07:18:16 LogicMachine kern.info kernel: [ 403.202974] fec 2188000.ethernet eth0: Link is Down
Apr 10 07:18:12 LogicMachine kern.info kernel: [ 399.154910] fec 2188000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
Apr 10 07:18:09 LogicMachine kern.info kernel: [ 396.122472] fec 2188000.ethernet eth0: Link is Down
Apr 10 07:18:07 LogicMachine kern.info kernel: [ 394.090543] fec 2188000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
Apr 10 07:18:05 LogicMachine kern.info kernel: [ 392.074183] fec 2188000.ethernet eth0: Link is Down
Apr 10 07:11:59 LogicMachine kern.notice kernel: [ 25.085470] random: nonblocking pool is initialized
Apr 10 07:11:51 LogicMachine kern.info kernel: [ 17.552836] fec 2188000.ethernet eth0: Link is Up - 10Mbps/Full - flow control rx/tx
Apr 10 07:11:48 LogicMachine kern.info kernel: [ 14.520618] fec 2188000.ethernet eth0: Link is Down
Apr 10 07:11:44 LogicMachine kern.info kernel: [ 10.472851] fec 2188000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
Apr 10 07:11:43 LogicMachine kern.info kernel: [ 9.472610] fec 2188000.ethernet eth0: Link is Down
Apr 10 07:11:39 LogicMachine kern.info kernel: [ 5.424837] fec 2188000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
Apr 10 07:11:37 LogicMachine user.info sysinit: /lib/genohm-scada/storage/db/current.db: OK
Apr 10 07:11:36 LogicMachine kern.info kernel: [ 2.539053] EXT4-fs (mmcblk0p3): mounted filesystem with ordered data mode. Opts: nodelalloc
Apr 10 07:11:36 LogicMachine user.info sysinit: /dev/mmcblk0p3: clean, 586/38400 files, 15267/153600 blocks
Apr 10 07:11:36 LogicMachine user.info sysinit: e2fsck 1.45.6 (20-Mar-2020)
Apr 10 07:11:36 LogicMachine kern.info kernel: [ 2.410687] fec 2188000.ethernet eth0: Freescale FEC PHY driver [SMSC LAN8710/LAN8720] (mii_bus:phy_addr=2188000.ethernet-1:00, irq=-1)
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 1.341007] fec 2188000.ethernet eth0: Freescale FEC PHY driver [SMSC LAN8710/LAN8720] (mii_bus:phy_addr=2188000.ethernet-1:00, irq=-1)
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.914990] EXT4-fs (mmcblk0p2): re-mounted. Opts: nodelalloc
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.509328] Freeing unused kernel memory: 164K
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.509057] VFS: Mounted root (ext3 filesystem) on device 179:2.
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.508968] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.428669] mmcblk0: p1 p2 p3
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.427090] mmcblk0: mmc0:b370 CBADS 7.48 GiB
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.426303] mmc0: new high speed SDHC card at address b370
Apr 10 07:11:35 LogicMachine kern.warn kernel: [ 0.420241] mmc0: host does not support reading read-only switch, assuming write-enable
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.388753] Waiting for root device /dev/mmcblk0p2...
Apr 10 07:11:35 LogicMachine kern.err kernel: [ 0.388681] Warning: unable to open an initial console.
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.388265] vdd3p0: disabling
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.387688] rtc-pcf85263a 0-0051: setting system clock to 2023-04-10 07:11:34 UTC (1681110694)
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.382265] can: raw protocol (rev 20120528)
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.382211] NET: Registered protocol family 29
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.382044] can: controller area network core (rev 20120528 abi 9)
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.382001] NET: Registered protocol family 17
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.381874] ip_tables: © 2000-2006 Netfilter Core Team
Apr 10 07:11:35 LogicMachine kern.warn kernel: [ 0.363169] 2198000.adc supply vref not found, using dummy regulator
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.348549] mmc0: SDHCI controller on 2194000.usdhc [2194000.usdhc] using ADMA
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.310675] sdhci-esdhc-imx 2194000.usdhc: No vqmmc regulator found
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.310632] sdhci-esdhc-imx 2194000.usdhc: No vmmc regulator found
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.308166] sdhci-pltfm: SDHCI platform and OF driver helper
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.308150] sdhci: Copyright© Pierre Ossman
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.308123] sdhci: Secure Digital Host Controller Interface driver
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.307204] usbcore: registered new interface driver btusb
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.306376] imx2-wdt 20bc000.wdog: timeout 60 sec (nowayout=0)
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.305222] lirc_dev: IR Remote Control driver registered, major 249
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.304347] i2c /dev entries driver
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.304077] rtc-pcf85263a 0-0051: rtc core: registered rtc-pcf85263a as rtc0
Apr 10 07:11:35 LogicMachine kern.warn kernel: [ 0.300385] rtc-ds1307: probe of 0-006f failed with error -5
Apr 10 07:11:35 LogicMachine kern.info kernel: [ 0.298459] hub 2-0:1.0: 1 port detected