Make sure your unit really is an r8169, and not an r8168.
Whilst (as I understand it) the  r8169 module is supposed
to work with an r8168, at least on my laptop (Acer Aspire E17
(E5-722-425Q), currently 18.04 (up-to-date)),
using the r8169 module has resulted in "flakely" behaviour
for as long as I can remember, including becoming unusable
after a (some?) warm reboot.
(Sorry, I cannot recall any specific details,
albeit I vaguely recall that was not the only problem I had.)
Using the r8168 dkms module, there has not been any(?) problems.
However, I believe the r8168 module (in package `r8168-dkms') is
specific to r8168 hardware and will not work with an r8169 unit.

Using `lspci' my r8168 is listed as:

   Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 12)

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  r8169 ethernet sometimes doesn't work after cold boot/boot

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