Hi all : I have a Mac mini (M4 chip, macOS 15.3.1) and I have the same issue. Whether I use the Mac's own Ethernet port or the USB-C to Ethernet port, the issue will occur. I have also tried to format the SSD completely and reinstall macOS online, but the issue still occurs. However, my Macbook pro M3 chip, running macOS 15.3.1, has never encountered such this issue. I really hope Apple can solve this issue.