Intermittent Connection via AEBS Lan Port

I have an AEBS connected to a cable modem via the WAN port, which allows my G4 laptop to access the internet. I have a G5 desktop (dual 2.3 w/o airport card) connected the AEBS LAN port. The internet connection to the G5 desktop intermittently fails and recovers. The internet connection on the G4 laptop does not fail during the connection failures on the hardwired G5 desktop.
I should add that there was a power failure/surge that resulted in a replaced startup volume on my G5 desktop. Apple did the diagnostics and HD replacement. Prior to that, both by wireless and hardwired internet connections worked flawlessly.
Any suggestions are greatly appreciated.

1-whether that HD is open to the world at its IP
assigned by the AEBS
If you are using NAT then you have a hardware firewall which stops unwanted connections to the NAS.
2-whether if someone can access it then does that
give them a portal to the rest of my network?
If they can access the NAS they already have access to the rest of the network. The NAS can not be a portal, you have to be on the network to connect to it.
It seems more secure to go 100% wireless, but maybe
that's a bad perception.
Wired is more secure than wireless, however if you are using WPA then you are pretty secure.
iFelix

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