Network Connection 
------------------

Problem: 
Internet connection will work properly when we connect to the Internet. 
After some time, you can see Internet connection is not working. 
If you open the properties of adapter and see the incoming and outgoing traffic then you can find massive outgoing packets and less incoming packets.  
It is because of conflicts in the speed and adapter fails to connect. In those situation you can adjust the speed and duplex of the machine to match.

Try the following steps to adjust
By default, auto-negotiation is enabled. Change this setting only to match your link partner. 
1.	Go to the Device Manager.
2.	Go to Network Adapter and choose the respective Network Connection.
3.	Open Properties on the adapter you would like to configure.
4.	Click the Link Speed tab.
5.	Select the appropriate speed and duplex from the Speed and Duplex menu.
6.	Click OK
References
1.	http://www.qdpma.com/dupwindm.htm, date of access: 23/03/2015