Mac's drop network sharing after a bit

I have an imac and a Macbook Pro but after a while which ever one i'm not using at that moment seems to loose connection with the other and I get a pop up telling me to ignore or disconnect. Everything was fine until I upgraded my norton antivirus 11, could that have anything to do with it? This is frustrating as sometimes I'm using files from the other computer and need to get or send files back and forth. Thanks!

sjam wrote:
I uninstalled norton 11 on both mac's and after a while the imac disappears from the shared list but not the PC. I don't get it!
From above, "I suspect you get dropped when the other machine goes to sleep. Try preventing them from sleeping, and see what happens." Note that machines disappearing from Shared under Sno is common. To reconnect to a Mac, use Go > Connect to Server--afp://IpAddress. Afterward it is likely to appear in shared for at least awhile.

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