All browsers lose internet connection after awhile

After upgrading Safari and Java yesterday, all of my internet browsers are losing connection after awhile (10 - 15 minutes), until I disable and enable Airport. However, when the browsers are dosconnected, the airport connection is still ok, because Mail stays connected. The disconnection in the browsers happens randomly.
So if 1 browser suddenly disconnects, all the other browsers cannot connect either. Mail stays connected. Browsers only connect after I disable and enable Airport
I tried the following stuff:
repair disk permission
maintenance
cleared java's cache
rebooted osx a few times
reseted router

Hi Tim
What does your Application/Browser log say in 'console' ?

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Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos Thumbs Up" on the right to say “Thanks” for helping!
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All browsers lose internet connection after awhile

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