router - ubuntu server refusing connections via port forwarding

Getting some really weird behavior from our Ubuntu
server... it's behind a Verizon router firewall with port forwarding (port 8080 to port
80 on the server), and we've been having issues accessing it via this external IP. From
within the network, it appears to respond normally (I can access it via web browser and
SSH), but refuses connections through port forwarding (using our static external IP).
The strangest thing is that it actually responds to external port-forwarded connections
right after being restarted, but quickly lapses back into this pattern of refusing
external connections.

I'm a bit of a
server newbie (I'm actually a programmer in a small startup that just lost their server
ops guy, urgh) so this is all trial by fire for me. Does anyone have any advice on what
could be going wrong here? Any help would be appreciated,
thanks.

EDIT:

We
have another server being forwarded on port 80, and it hasn't had any accessibility
problems. So now I'm beginning to think it's a problem with the server. But what would
prevent a server from accepting port-forwarded
connections?

EDIT
2:

Okay, now this is
really bizarre... it seems that the :8080 external address works in
my browser immediately after I SSH into the server via the local IP in the terminal...
and then it stops working shortly thereafter. Any idea what could be behind
this?

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