I am currently using an iMac running Lion and am having problems sharing my internet through WiFi.
The iMac is connected to the internet through ethernet and I share that connection through WiFi to my iPad and iPhone.
The WiFi icon in the menu bar will randomly switch from the sharing icon (grey with an up arrow) back to the normal WiFi icon. At this point my iPad and iPhone no longer see the network.
When I go into my sharing preferences in Lion, the "Internet Sharing" box is still ticked and it says its connected, but I have to stop it and start it again for it to actually work. Any help would be appreciated.