i have just made the switch from pc to an iMac (running OS X), and have a problem with my wireless network. I can get the iMac to recognise the network and access the web, but then (on a fairly frequent basis) the iMac loses the Network. I then run Network diagnostics and it re finds the network. The network is a Dell Truemobile, and the signal strength is full. Does anyone know how i stop this problem