Screen sharing across internet

I had set up my Mac for screen sharing with Lion and was able to share the screen to another Mac on the local network, or VNC across the internet. Upgraded to Mountain Lion and screen sharing continued to work both locally and remote.
Moved to Mavericks and now the screen sharing works locally, but will only work for about 30 minutes across the internet. If I reboot the Mac, then I can access the screen across the internet for about 30 minutes, then the connection drops and I would have to reboot the Mac again.
I have screen sharing turned on by:
System Preferences -> Sharing -> Screen Sharing. Clicked on 'Computer Settings...' and checked 'VNC viewers can connect...' and gave it a password.
I can access this remote Mac across the internet using either JollysFastVNC, or the screen sharing app via Finder. Turns out that remote command line and Finder also can access this machine for about 30 minutes, then connection drops.
Has anybody else seen this problem, or have any suggestions on what I can try to keep remote access working for more than 30 minutes?

I don't have a solution (yet). I have the same problem with a Mac Mini remotely. After some short length of time, my ability to control remotely vaporizes. The Mini is running 10.9.1. It seemed to work ok earlier - although the previous version of Mavericks kept screen sharing from working if the firewall was enabled at all. The last system update from Apple fixed that.
But this isn't universal. I can connect with LogMeIn to the Mini after a fresh reboot, but eventually (30 min?) all I get is a black screen. I can connect with LogMeIn to a MacBook Pro on the same remote network as the Mini and it works just fine. I can even connect with LogMeIn to the MacBook Pro and then do screen sharing to the Mini on the same remote network - until that 30 minute? window has elapsed, and then screen sharing fails to connect without even telling me it failed (no black screen, no alert, nothing). Then that doesn't work either. File sharing from that MacBook Pro to the Mini on the same remote network continues to work, and server applications continue running fine on the Mini. For some reason the only problem is that I can't *see* the remote Mini on 10.9.1 for more than a short period after a reboot. All 3 computers involved are running 10.9.1, but only one (the Mini) is failing like this.
It sounds like the problem you are having. If I figure anything else out I'll let you know.

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    (bump)

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