I have a Mac Pro and every time I leave the machine for several hours when I return the Airport signal strength indicator is blank and I have to re-choose my network name to get back on the network.
As background, my Mac Pro is setup to never go to sleep as it is hosting some web sites, the only thing that sleeps is the display, so I don't think it is any kind of issue on wake from sleep . . . it just drops the signal at some point.
Has anyone ever heard of this kind of issue? It has always been this way and I just moved my Mac Pro to a location in my house where a wired connection is no longer feasible so I really want to try and resolve it... THANKS