LAN interruption, connection problems

In a 100 nodes LAN, some computers connected to the main switch in itroom are dropping connectivity every 30 mins, need case studies that would help me isolate this problem ASAP.

It'll bring connection back as soon as you make a dhcp renewal on the current node down.
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Are there any firmware updates for your switches?  I had some odd problems with several DGS-48 switches until I updated the firmware.

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What is the dhcp lease renewal time?
Spirit_USAuthor Commented:
Thanks to both of you, the lease time is 15 days...
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