Интернет stops working after в while

I recently upgraded from 12 to ubuntu 14 and since then I am getting this issue. My problem is that after в while using the Интернет it stops working and to get it working again I have to disconnect and connect to the Интернет again. I am using ethernet on my ПК. Any разрабатывает? I have tried tons of solutions but none of them пахал working.