7i80 Resource temporarily unavailable

hi, my 7i80 lately emits this message "Resource temporarily unavailable" but not always. the power supply is good 5.08 volts 5 amps, the cable I tried to change it but it is the same. I am attaching the results of "ip a" when it works and not but they look the same. the interfaces file and linuxcnc report. if I turn off the 7i80 and turn it back on it usually works without ever giving errors. regards Mauro

I would disable IPV6 on eth0

Removed but nothing has changed.

Whenever I've seen that error its related to some network change on the host PC

If you are not losing the 7I80 link, its probably unrelated to the 7I80

the interfaces file looks ok? i will do some tests anyway once reset then it works great. there is certainly something wrong with the network ... I had to put rfkill unblock for the wifi network otherwise it was soft blocked. now it's OK I rewrite when I can do something thank you

now it seems to go regularly. I had Megasync on startup, it probably crashed the 7i80. I have removed auto-start for Mega and it hasn't given any more problems.

nooo I spoke too soon!!!  the problem always exists.
the pc is nuc 7i3 bnh driver e1000e I am attaching the command ethtool -i eth0