Internet connectivity issues

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http://askubuntu.com – I'm on 12.04, I upgraded a month ago from Windows 7 on my Sony VAIO. Everything is great except after the upgrade, I encountered Internet connectivity issues. When browsing the web or loading videos, my Internet will stop working in the middle and come back after a period of 30 seconds to 2 minutes or sometimes it just won't and I'll have to disconnect and re-connect to the network. I've noticed the issue when sending e-mails as well, they just won't send at all. It says sending request and the circle keeps spinning slowly until I get to a page where it says the page wouldn't load and gives (HowTos)