3548 - Network Connection Lost

so I work with a debt consolidating company. We have about 300+ users, and som of the issues I get are network issues from random users. The issue is that there is a lost in connection and they are completely disconnected from the network. I look at the port number labeled at their cubicle and check the switch they are connected too and this is what I see on the switch. Which by the way is a dell PowerConnect 3548 switch.URL

After removing from those ports and placing the patch cable into another port it works normally. But after a few days this issue returns only to find it with a different user.