Reasons for ethernet interface to stop responding for ~30 seconds, then acknowledging all received packages?

First question! Hi! Running on Ubuntu 16.04. Hardware info: lspci | awk ‘/[Nn]et/ {print $1}’ | xargs -i% lspci -ks % 00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (2) I219-V Subsystem: ASUSTeK Computer Inc. Ethernet Connection (2) I219-V Kernel driver in use: e1000e Kernel modules: e1000e 02:00.0 Network controller: Intel Corporation Device 093c (rev 3a)…

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