Network connection automatically keeps down and up on Centos7

You can find below error on /var/log/message/

Issue:: 

NetworkManager[642]: <info> Activation (enp0s3) successful, device activated.

avahi-daemon[531]: Registering new address record for fe80::a00:27ff:fe6a:55a4 on enp0s3.*.

qidiziCentos kernel: e1000: enp0s3 NIC Link is Down

NetworkManager[642]: <info> (enp0s3): link disconnected (deferring action for 4 seconds)

NetworkManager[642]: <info> (enp0s3): link disconnected (calling deferred action)

NetworkManager[642]: <info> (enp0s3): device state change: activated -> unavailable (re

fix ::

$ systemctl restart networkmanager

$ systemctl restart network

$ ifdown <devicename, e.g. enp0s8>

$ ifup <devicename, e.g. enp0s8>