Ethernet connects fine initially, but after a few minutes traffic stalls, packets drop, and both SSH and NVIDIA Sync disconnect while NetworkManager keeps retrying.
Hi, I think your issue is very similar to another thread where users discussed unstable Ethernet on DGX Spark after recent updates. You might find some useful insights and a workaround there. Check out this discussion: DGX Spark: Ethernet connection unstable after November 2025 update – EEE (Energy Efficient Ethernet) workaround