Cabled internet connection keeps dropping

[RIHTT 0]

Hey all, Over the past week or so my computer has had a strange issue. Every now and then the internet connection via LAN cable suddenly disappears for no reason I can think of. The tray icon changes from cable connection to the Wi-Fi icon. It's not my router (I think) because the Wi-Fi on my phone still works fine. Rebooting the router does not help anyway. After rebooting the computer things are back to normal again (at least for the time being...).

I can find many posts about Wi-Fi connection dropping, but none about cable connection dropping. Anyone got an idea? My specs:

Model: Intel NUC12WSHi7
CPU: 12th Gen Intel(R) Core(TM) i7-1260P, 2100 Mhz, 12 Core(s), 16 Logical Processor(s)
BIOS: Intel Corp. WSADL357.0090.2023.0821.1714, 21/08/2023
Motherboard: Intel NUC12WSHi7 version M46422-304
Memory: 64Gb
Graphics: Onboard Intel Iris Xe Graphics
OS: Microsoft Windows 11 Pro (64-bit) Version 24H2 10.0.26100.6899
Disk 1: Adata Legend 710 2Tb SSD
Disk 2: PNY CS9000 2Tb SSD

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