I have created an Ad-Hoc network in Windows 8..

At first I can connect to it and have access to internet without any problems, but after a while (an hour or half) I lose the internet access and if I disconnect from it and try connecting again I cannot even connect to the network.. So what is the problem here.. 

Hi,

Have you run any third part security app on your computer?

If so, please disable it to check the issue.

Then, if the issue still persists, please make sure that the latest Network adapter driver from manufacturer's website has been installed.

In addition, please uncheck following option under properties of your network adpater in device manager:

Let's restart the computer to check the results.

If we cannot get this worked for your issue, please help to post back the results of this command:

ipconfig /all

Keep