Realtek RTL8111 kext leading to periodically Arris internet router reset.

I have nowadays two hackintoshes, which work perfectly for a long time. A some time ago my internet provider (called "NET") changed my modem, installing a new one with builtin router (Arris router/modem). At that moment I was using TPLink router plugged on old modem without any problem, with all my network configured inside it. So, I simply connected TPLink on Arris router/modem, and made the necessary configurations to bring my internet servers on!
All worked fine, except one thing. Every...

Realtek RTL8111 kext leading to periodically Arris internet router reset.