Have you tried the firmware update? It solved 90% of my problems. If I use the printer or scanner daily, I seem to no longer lose the connection. I did have to reboot the printer yesterday, but that is far better than how it had been.
For the moment, I can see the printer from my MacBook, My wife's MacBook, and my iPhone and iPad. I don't know when the 3.0 firmware was released, but I sure hope I can come back next week (or even tomorrow) and say that this is still working.