I have 3com switch 4200 28 port, always it s showing for the users Disconnected from time to time

I have 3com switch 4200 28 port, always it s showing for the users Disconnected from time to time, the solution is to off it and on it again? what I should do , replace it?
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Maybe it's just a spanning tree problem. Can't be to specific about 3com because i only know cisco but there should be an option to disable spanning tree for ports which are attached to normal hosts. The cisco option is "spanning-tree portfast".

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i_harfoushAuthor Commented:
could be also from patch panel-cable loose?
i_harfoushAuthor Commented:
it was something like this
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