Safari keeps losing Internet connection.

MBPr, 10.8.2, all other devices on the wifi network run fine, other software on MBP are actively connected to the net and wifi connection still showing as connected..it is just safari.

Reconnecting to network shows no love, have to restart computer to get working safari for less than ten minutes then same problem comes back.

Any help or similar problems appreciated.

Oh this has only started since I upgraded to 10.8.2....