Ethernet Failure after Deployment

Hi,

"Inconsistent Ethernet Functionality" is a rather loose description. I'd start with state-of-the-art diagnosis tools like Wireshark to determine what's exactly failing.

I'd expect a software problem in the first place. Respectively used Ethernet IP and software stack should be considered. As far as I'm aware of, there are also diagnosis options inside Ethernet stack, starting with simple things like error counters etc.