As per my PC specification.My LAN card supported on 1Gbps connection.
We are using SAP,Intranet,pop3 server email which is little bit slow working due to 10Mbps slow speed instead of 1Gbps.
If timing out problem occur then our other office PC should be create problem but others PCs are working fine.Only my PC create problem same as shown on my attach picture
My PC specification
32 bit operating system
Core 2 duo CPU E7500 2.93Ghz
Network Built in Adapter
Broad com Net Link TM Gigabyte Ethernet
Approximately 300 PC connected with our network with different work group with my work group total 15 computers are showing.I personally check 5 computer no problem on those computer regarding connection drop problem.