Very frustrated. My VPN is blocked. It'll run for a few minutes , then the connection will slow to a crawl and I'll get a message: THIS SITE CAN'T BE REACHED. When I quit, I'm able to access the site. I've tried (2) different VPNs with the same result. I was recently in Costa Rica and flew through multiple airports with NO VPN issues. This seems to be a Verizon Fios quirk. What is the fix?