I made an upgrade to CISCO Linksys E2000 and ever since came the problems.
Return it and get another Netgear router, a High Performance Dual Band Wireless N.
Make it secure here
This is what is causing your problem, it's Ciscos router firmware change.
Return your DNS back to your ISP's, Google DNS only works well if there is a server in the same location as your ISP's server and really offeres little benefit, just bypasses if the ISP DNS is having temporary problems, complicates your long term stability greatly, slows downloads too.