Comment 55 for bug 1785171

>I may have stumbled on a workaround for the disconnection issue, though I can't be sure.
> To narrow down the time when the connection stops working, I left a ping to my router running, >every 4 seconds.
> ping -i 4 192.168.1.1 > ping.log

This is correct. Running an active ping probe mitigates the disconnection issue.

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00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (7) I219-LM (rev 10)
 Subsystem: Hewlett-Packard Company Ethernet Connection (7) I219-LM
 Kernel driver in use: e1000e
 Kernel modules: e1000e

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4.18.0-17-generic

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Ubuntu 18.10