After installing OSX Mavericks I have noticed that my internet connection is lost after the computer "wakes up" from sleep mode. Re-booting restores the connection. My iMac is connected by ethernet cable to a DLink DIR655 "N" router (gigabit ethernet). I never had this problem before installing OSX Mavericks. There is also a DLink gigabit switch between the computer and router. Is this a bug in Mavericks? Or is there some setting that I need to adjust?