Safari - Internet Connection Failures

My fathers Mini Mac has started to play up when using Safari. When surfing, the connection will appear to have been lost and no page can be loaded. The only apparent solution is a restart.
I downloaded Google Chrome to see if that was affected in the same way. It appears to be affected too.
What is strange though, is that Mail seems to run and connect fine after the browser failure. My iPhone has a full internet connection, so no problems with the wireless.
Any ideas?

Hi,
Make sure it's not a proxy...
Open System Preferences / Network then click the Advanced button then select the Proxies tab.
If any of the boxes are checked on the left under: Select a protocol to configure: Deselect the boxes then click Ok.
Restart the Mac.
And just to make sure it's not a connection issue, click the Assist Me button then click Diagnostics in System Preferences / Network. If any of the buttons on the left are red, click Continue.
Carolyn

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