IPad 2 wifi issues with iMac internet sharing

I have the iPad 2 [ (Wifi + 3G) ( iOS 5.1.1 (9B206) ] which connected to my 21" iMac [Mac OS X Lion 10.7.4 (11E53)] through Internet sharing seemlessly some time back.
However of late, with latest software updates on the iMac & iPad, the connection seems to work only intermittently.
The connection breaks every half or one hour, despite both the devices being in the same room.
I have tried almost all suggestions on forums like resetting your network settings on iPad, changing channels on the iMac for Internet sharing, with or without password security, resetting the firewalls on & off on the iMac, but nothing seems to work & the only way is to reset all your settings all over again.

I used Internet Sharing like this couple of times!
The situation happens is that when you share your internet over Wifi, and you password protect it, when you connect the iPad or any iDevice to that new hotspot, it happens that after selecting that hotspot, we need to turn on "Auto Join". So when the iPad gets disconnected, it gets disconnected completely and you need to connect back once again. So when you turn on "Auto Join" it will get connected automatically once again it gets disconnected maybe due to power saving or suddenly it leaves the hotspot.

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