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1811K9 NAT config. not working in 891K9, config. items missing?

A new industrial control system uses 891K9's, an existing system uses 1811K9's.

We are using (1) 891 per identical machine group  w/NAT to translate to translate identical IP's/ports in each group (LAN side/inside) to unique IP's in another subnet (WAN side/outside) (Port forwarding).

At the office I tested an 1811 config. in a new 891 and was able to connect to a piece of the equipment on loan for this test. Communications were good, no issues.

Onsite, the 891 is able to establish communications & all is well for about 15 minutes, then comm's fail and I lose comm's.

I've done this on many systems with the 1811 but cannot get the 891 comm's to remain on.

Attached is the Router config. used.

My PLC (outside device) is looking at the Router FE8 WAN address and inside device static IP/logical port in the LAN, through theLAN ports to the machines switch/hub where the devices connect.

Is there a config. detail that needs to be in the 891 that the 1811 didn't need or have?

I use the blue cable w/Hyperterminal/CLI to copy/paste the config files into the Routers. I use "Write erase", "Reload", "enable" then paste to host in Hyperterminal and the config self loads. No issues with that procedure, logging in to the new Router config, etc.

Thanks in advance, I'm onsite now, any help is appreciated.

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