Hello!I purchased 2 months ago a macbook pro retina display,8GB ram,2.4GHz processor and i am having some problems...At first,every browser(Google chrome,firefox) expect Safari are very laggy!Is this normal??Furthermore,some times when i am online via wifi the internet connections stops,i am connected to the wifi but i am not having internet access but every other device in my house does,even a very old laptop that i used to own!Can you help me please in any way??I am really tired of this situation