Fabby
3
Please read this:
Especially the Linux has multiple kernels section, then try an LTS kernel and hopefully the problem will go away “automagically”. 
If that doesn’t solve the problem,
- Activate the AUR
- look for a
Realtek RTL8111/8168/8411
- follow the AUR instructions above to install said driver
Unrelated to your issue, but please read this too!
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