need Help for my ethernet swith

we r 4 users using adsl line on 8-port swith, one of the users is doing damage to his port every 5 or 6 days , ( the led is stedy green and no cnnection ) then we move him to a new port , after 5 or 6 days the port is damaged again.
what could be the problem ? his NIC or the cable or what ?

 

 

 

 

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