Ps4 land cable no longer connected?

So I play fifa online and sometimes I'm thrown out in the middle of the game with the message no lankabel connected. Does my lankabel have loose contact?

Or your internet is too bad or sometimes goes off.

But I have had the Wi-Fi that I use since December and I have only had this problem for a week

It can be a loose connection, but it can also be somewhere on the cable, e.g. A crack.