Internet Connection lose after 2 hours

I have Acer laptop and qualcomm atheros wireless network adaptor, after hours of using my laptop i suddenly lose connection to internet but my wireless is still connected. I tried Uninstalling and reinstalling the wireless adaptor but it still wont work. I also tried connecting it to cable after losing the internet but it didnt fix the problem. I use diagnostics and it tells me that i have internet connection but i cant login to apps use browsers and etc. Pls help