Iphone 4 ios6 doesn't want to stay connected to internet?

After every half hour or so and when i come back home i always have to reconnect to the internet. This has never happened to me when i had the previous ios's. Do you guys have any suggestions to fix this?

Settings > Wi-Fi > turn Off and On again to force a fresh connection.

If still not working properly tap the blue arrow head to the right of your network's name. Tap the DHCP tab, scroll down and tap the Renew Lease button.

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