Connecting to shared machines (either via Share Screen or file sharing)

I have a MobileMe account and four computers in separate locations which I regularly need to connect between. Some are on static IP's and others are on dynamic IP's. So all of them have file sharing enabled as well as screen sharing enabled. They're also all registered in my MobileMe account. Anytime I'm in a Finder window, in the sidebar, I see Shared > (computer name) and see all the computers there. If I click on it, I'm offered two buttons, one to "Connect As" if I want to file share, and "Share Screen" if I want to VNC.
I would say 60-70% of the time I click on either of those buttons, it doesn't work. It takes about a minute to try and connect, then says, "Connection failed to (computer name). Please make sure screensharing is enabled...blah blah blah..." (it is)
However, 40-60% of the time if I click the same button again, it DOES work!
Sometimes it takes several tries.
It's really frustrating that I can't reliably connect to the other computers in the MobileMe list.
Does anyone else see this and are there any suggestions? There doesn't seem to be any rhyme or reason to it. Trying to connect to a computer that has a static IP vs. dynamic fails with about the same regularity. So I don't think that's it.
I also get about the same failure rate when trying to use Connect As to fileshare. So I don't think it's a VNC/screenshare-specific problem.
I've tried using DynDNS as an alternate way to reliably locate another of my computers. It fails with approx. the same failure rate, and sometimes works upon re-attempt.
HELP!

Goto your System Preferences->Sharing, Then select the Internet tab.
From the drop down menu select 'Share your connection from: Kyrocera card.'
And in the 'To computers using' box tick built in ethernet and connect a network cable to your powerbook and the other end to your network.
Or if you have an airport card installed share the connection using your airport.Then other wireless devices can connect to your powerbook.

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http://support.apple.com/kb/PH15026
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Connecting to shared machines (either via Share Screen or file sharing)

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