Projector Cannot See Mac Mini (Intermittently)

Hi all!
I am utilizing a Mac Mini (1st Generation) to run video to a projector in a theatrical setting.
This mini has been rock solid and I have used it to do this since May of 2013. About two weeks ago the connection to the Projector began intermittently cutting out. We'd let an audience in, and out of nowhere the projector would search for signal and then reconnect. There are many variables here so initially I believed it was just a loose connection between the VGA and mini display cable.
It continued to happen, almost at the same time every night, 1 minute to show. It then would resolve and be fine until shut down and startup the next day.
Thinking it might be an update issue (as the update reminder was happening close to these blink outs) I updated to Mavericks.
Things appeared to return to normal, then tonight the projector went searching for signal and never recovered so we shutdown the projector for the night (impossible to troubleshoot with patrons in house).
I am completely unclear what is happening, the mini will always tell me it sees the projector, but now the projector appears to selectively be missing the mini. It's not a loose connection or bad cable, and (even odder) it happens only once we've begun seating patrons never during preshow.
There are so many variables here I am looking for any level headed advice on how to get things back to standard operating procedure.
Thanks all!
Josh

This sounds like a simple port forwarding issue, but I don't understand your LAN setup.
The WRT300N has DDNS service set up. NAT and RIP are disabled.
The chances are, you're running NAT somewhere in your network. If not the WRT then what? If it's your cable modem then you must have port forwarding configured on the cable modem, and that's where you need to focus - change the port forwarding to point to your Mac Mini's address rather than the WRT.
HOWEVER, it is far more common to have the wireless router perform NAT and DHCP, which is why I question your setup.
Not directly related, but:
The Mac Mini DHCP is reserved
Nix this. Your server should be configured manually, with a static IP address, not DHCP, even with a reservation in the DHCP server. The only advantage of DHCP is for dynamic hosts (hence the 'D' in 'DHCP') or if you expect to change your entire local subnet on any kind of frequent basis. The reality is that you can't just change the IP address of Mac OS X Server like this - there are too many dependencies, so it's better to set it manually, knowing that there's a cost (and pain) to change the server's address.

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Projector Cannot See Mac Mini (Intermittently)

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