How to fix iMac losing Wi-Fi connection again and again? My iMac loses its Wifi connection from minute to minute. To make it active again, I have to run "Assist Me..."  from the Network preferences panel. 

This is really, really annoying. 

Does anyone know what's going on?

I'm running Mac Os 10.7.4.
You may find that another device is causing interference such as a cordless phone or microwave, or even a neighbour's wifi device. Try changing the channel on your wifi router.

It may be worth using the "alt-trick" to check what's going on with your wifi - when your wifi is connected, mouse over the wifi icon in your system tray, hold down the alt key then click on it. You should see some additional info, like the following:



Keep an eye on the Transmit Rate and RSSI; if they're poor it could be a sign that you need to change the wifi channel.

You can also use Lion's hidden diagnostic app to see what could be causing problems for your wifi.