Mesa 7i92 MAC no longer retrievable

Hi
I have a 7i92 that has been running in a machine for several weeks without problems. This morning LinuxCnc does not connect to the board and the error is that it cannot retrieve the MAC address.
The pc is connected to the 7i92 port as it reports that when the cable is plugged in. I however cannot ping the card at 10.10.10.10 which is the address that has been used from the word go.
I have heard from others that the 7i92 has a tendency  to die but I cannot see that just happening without any good reason.
Has anyone had the same experience and if so how do I recover the board?

I am not at the machine at the moment and the internet is on Africa time.
When Linuxcnc starts up and the hostmot2 driver loads it looks for the MAC address at 10.10.10.10. It does not find it or does not communicate.
The strange thing is that network manager says the port is connected to the meas card but I cannot ping it either.

WIth ip a I get all the interfaces with their ip addresses correct.

lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp1s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
link/ether 1c:69:7a:43:71:ae brd ff:ff:ff:ff:ff:ff
3: enp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 1c:69:7a:43:71:ad brd ff:ff:ff:ff:ff:ff
inet 10.10.10.1/8 brd 10.255.255.255 scope global noprefixroute enp3s0
valid_lft forever preferred_lft forever
inet6 fe80::53a6:3fbd:7e53:a802/64 scope link noprefixroute
valid_lft forever preferred_lft forever
4: wlp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 38:68:93:58:bc:f9 brd ff:ff:ff:ff:ff:ff
inet 192.168.0.126/24 brd 192.168.0.255 scope global noprefixroute wlp2s0
valid_lft forever preferred_lft forever
inet6 fe80::4f47:907c:6f2f:7798/64 scope link noprefixroute
valid_lft forever preferred_lft forever
plotter@plotterone:~$

We did all the pushing and shoving. It's a new machine.
This is the error in detail.

That LinuxCNC message simply means there is no communication.

When you try to ping the card, what error do you get?

Can you access the card at 192.168.1.121?
(move jumper, cycle power, setup host IP)

If so, try running:

mesaflash --device 7i92 --addr 192.168.1.121 --verbose

and posting the results here

When I ping I get Host cannot be reached.
When I unplug the cable I get connection lost and when I plug it in again I get the connection restored from linux.

I have to go to the machine on Monday as it is far from me. I did remote support. I will try the 121 address when I get there.

P.S. We have a number of 7i92's that did the same. We just left them as dead but I would like to get to the bottom of this so we can recover the other cards as well.

Its an odd problem, it may be that there was a bad batch of EEPROMs
that "forgot" their data over time (this is very hard to test for even for the chip manufacturers)

If the card is accessible at 192.168.1.121 and the EEPROM IP address
has changed, this would confirm this theory.

Ok I will test that on Monday and report back.