On an orange pi one I notice the same regularly:
│Jan 21 15:50:25 a-m kernel: [ 1757.658898] dwmac-sun8i 1c30000.ethernet eth0: Link is Down │
│Jan 21 15:50:27 a-m NetworkManager[1119]: <info> [1674312627.1444] device (eth0): carrier: link connected
...
I can test with multiple samples.