I don't know if this is a known issue... I looked at the long "intel mac airport problems" thread, but that seems to be about slow connections, not dropped connections. My new iMac core duo gets a fine wireless signal most of the time, but sometimes the bars go from black to grey and I lose the signal. It comes back a few seconds later on it's own. Nothing in particular seems to cause it. A powermac G4, macbook, and several other macs all have had no problems connecting to the same network. Anyone seen this before?