Why does my iMac WIFI disconnect after 3-4 Hours?

I have an iMac 3.06 Intel Core 2 and my wifi disconnects after 3-4 hours of use. I can't reconnect to the network until I turn-off the wifi and turn it back on. It appears the ip lease time is up and must be established manually by turning off the wifi and turning it back on (just a guess). Is it possible the firewall or another piece of software is blocking the process? I have an iPhone, MacBook and iPad in addition to the iMac and they all connect properly and stay connected. Does anyone have any ideas what I should verify to get the process working? During the period of time when the iMac is connected all is well. The iMac is running 10.7.2 op system. Thanks for your help.

I'm havingn the same problem

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