Ok, I have a MSI GE70 0ND-033 Laptop with an Intel(R) Centrino(R) Wireless-N 135 adapter in it. When I had Windows 7 everything worked perfectly. I upgraded to Windows 8 and now suddenly I am randomly losing my internet connection. I will be fine one moment then the next I won't have any connection, it will show only my network listed and it will say that connection is limited. If I disconnect from my network it will say no networks are available and will be unable to even see mine anymore until I disable and renenable the adapter. Generally when it happens I just run the diagnose feature and it resets the adapter for me and tells me that the problem was that the "Default gateway wasn't available".
I have the most recent drivers - I have run Windows update and made sure everything there is up to date - I have confirmed that the adapter is windows 8 compatible... I don't know what else to do. Sometimes I can hold on to the internet for 5 or 6 hours, sometimes 5 or 6 minutes, it's entirely random.