Safari and firefox 'cannot find the server' for every other page that i navigate to, unless I turn Wifi off and on. How do I fix this?

Safari and firefox 'cannot find the server' for every other page that i navigate to, unless I turn Wifi off and on. Once i reconnect to the network, the page loads, but after loading a few more pages, the same thing happens all over again.
This happens each and every time, on different Wifi networks, in different locations.  On the other hand, I don't ever encounter this problem when I tether my laptop to my mobile phone's 3g/2g network using Personal Hotspot. How do I fix this?

Try this DNS server ...
Open System Preferences > Network > Advanced > DNS
Click + and type:
208.67.222.222
Click + again and do the same.
208.67.220.220
Click OK.
Quit and relaunch both your browsers to test.
If that doesn't help, try here >  iOS: Troubleshooting Wi-Fi networks and connections
And here >  Wi-Fi: How to troubleshoot Wi-Fi connectivity

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