Hi everyone!
I noticed in dmesg that my ethernet link is flapping all the time
[Oct25 18:55] r8169 0000:02:00.0 enp2s0: link down
[  +3.131667] r8169 0000:02:00.0 enp2s0: link up
[Oct25 18:56] r8169 0000:02:00.0 enp2s0: link down
[  +2.763688] r8169 0000:02:00.0 enp2s0: link up
[Oct25 18:59] r8169 0000:02:00.0 enp2s0: link down
[  +3.060069] r8169 0000:02:00.0 enp2s0: link up
[Oct25 19:00] r8169 0000:02:00.0 enp2s0: link down
[  +3.559610] r8169 0000:02:00.0 enp2s0: link up
I changed the cabling, tried to plug into another switch no difference. 
Any ideas will be very appreciated as this flapping brings a lot of inconvenience.
My device in lspci:
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 10)