Internet stops working after Mountain Lion upgrade

After my computer goes into sleep or hibernate mode it won't reconnect to the internet. It shows that I am still connected to the network but i cant browse to the internet.
After turn off and on the Wi-fi it works back again but after a sleep the problem reappears.

Any help or tip will be really apreciated.

Have a look at this article:

Fix OS X Mountain Lion Wireless Connection Problems

...and let us know how you make out.

Had a similar problem with Snowy. Making a new connection fixed the proble,m and it hasn't come back ( looks for large piece of wood)

cwa107 said:

Have a look at this article:

Fix OS X Mountain Lion Wireless Connection Problems

...and let us know how you make out.

Click to expand...

Yes have tried the tips on this link but still got problems after the computer wake-up, wi-fi is conected but doenst have internet access.