DNS Servers do NOT stick !!!

[valdus2]

Trying with ipaddress commands ipaddress1-5, and after restarting the DNS servers are always 0.0.0.0

Trying resetting everything and giving again the commands, always the same...
It respects ipaddress1-3 but not the dns servers ipaddress4-5.

Last resort, restoring a config with the correct dns servers and ...Nothing! DNS servers always at 0.0.0.0.
Decoding the .dmp file with decode-config, just to be 100% sure, and it has all the correct addresses:
"ip_address": ["192.168.0.141", "192.168.0.254", "255.255.255.0", "1.1.1.1", "212.205.212.205"]

I tried all the above even after upgrading to release and development versions with dhcp which is the only mode that it can take dns servers.

The same is happening to a c3 ESP8685 v0.4, to a Sonoff ZBbridge pro, and a Sonoff dual R3v2.

Please help me........