Need help with Netgear router and VNC connection...

[N H]

I have a home network hooked up through a Netgear wireless router. I am hard 
wired to the router and I have 3 other systems that connect to it via the 
wireless signal. The issue I am experiencing is, I can log on from my work 
computer through realVNC (server/viewer) and stay connected with no issues. 
However, once I log off and wait for any length of time (say 30 minutes or 
so) when I try to reconnect from the outside I cannot get connected. I get 
the unable to connect/timeout error/comment box. It's like my router is 
completely tuned out to my outside request. The home computer does not seem 
to loose the connection to the router as it's still able to get on-line and 
even VNC my work computer. Once I reboot the router (someone in the house 
does it for me) I can then log in again just fine. If I log off and log back 
in immediately there is no issue. I don't seem to have any other issues like 
loosing the connection while I am logged on, just when trying to log back 
on. I have the port forwarding set up correctly and have tried playing with 
the router settings (ie. turning UPnP on and off, trying different MTU 
sizes, etc.) but to no avail. I have set my personal ip address up as a 
reserved number (.10) so that I always get the same ip whenever my computer 
connects to the router so there is no conflict with the other wireless 
units. Might be something simple but I'm just not figuring out what to do to 
allieviate this problem. Any help would be greatly appreciated. I have also 
tried different port settings through VNC and have also tried TightVNC but 
get the same results with either.
Thanks!

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