ssh over wifi failed (connection reset) but ssh over the wire is ok

I am trying to ssh via wifi from 192.168.0.10 into a synology server. (192.168.0.11)

The connection is failing when started from a NUC via wifi(192.168.0.10 - wlp2s0)
The connection is ok when started from the same NUC but via the wire (enp0s25).

When started from any other machines (even another NUC) the SSH connection is successful (wifi)

I tried with 2 distros (mint19.2 and debian10) but the problem is still the same. I always got: "ssh_exchange_identification: read: Connection reset by peer" when the connection is tarted from the NUC 192.168.0.10.
I even tried to use another wifi usb key but it is still the same.
I also tried to give another IP address to this NUC but problem is the same.

What is driving me crazy is that when I started to SSH from 192.168.0.10 to another machine (eg. 192.168.0.107) it is ok

So, to resume, I can NOT connect via wifi from 192.168.0.10 to 192.168.0.11
But I can connect via wifi from any other machine to 192.168.0.11

Here below the ouput from 192.168.0.10:

ssh -vvv 192.168.0.11
OpenSSH_7.9p1 Debian-10+deb10u2, OpenSSL 1.1.1d 10 Sep 2019
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: resolve_canonicalize: hostname 192.168.0.11 is address
debug2: ssh_connect_direct
debug1: Connecting to 192.168.0.11 [192.168.0.11] port 22.
debug1: Connection established.
debug1: identity file /home/carex/.ssh/id_rsa type 0
debug1: identity file /home/carex/.ssh/id_rsa-cert type -1
debug1: identity file /home/carex/.ssh/id_dsa type 1
debug1: identity file /home/carex/.ssh/id_dsa-cert type -1
debug1: identity file /home/carex/.ssh/id_ecdsa type 2
debug1: identity file /home/carex/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/carex/.ssh/id_ed25519 type 3
debug1: identity file /home/carex/.ssh/id_ed25519-cert type -1
debug1: identity file /home/carex/.ssh/id_xmss type -1
debug1: identity file /home/carex/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.9p1 Debian-10+deb10u2
ssh_exchange_identification: read: Connection reset by peer
ca@nuc:~$

Here below the output from 192.168.0.109:

ca@ux31:~$ ssh -v 192.168.0.11
OpenSSH_7.4p1 Debian-10+deb9u7, OpenSSL 1.0.2u 20 Dec 2019
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to 192.168.0.11 [192.168.0.11] port 22.
debug1: Connection established.
debug1: identity file /home/carex/.ssh/id_rsa type 1
debug1: key_load_public: No such file or directory
debug1: identity file /home/carex/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/carex/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/carex/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/carex/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/carex/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/carex/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/carex/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.4p1 Debian-10+deb9u7
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.4
debug1: match: OpenSSH_7.4 pat OpenSSH* compat 0x04000000
debug1: Authenticating to 192.168.0.11:22 as 'carex'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:z0DAQErw+BC6hRmmSczy83VyunS5ILpweivBPDafzYs
debug1: Host '192.168.0.11' is known and matches the ECDSA host key.
debug1: Found key in /home/carex/.ssh/known_hosts:2
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521>
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /home/carex/.ssh/id_rsa
debug1: Server accepts key: pkalg ssh-rsa blen 279
debug1: Authentication succeeded (publickey).
Authenticated to 192.168.0.11 ([192.168.0.11]:22).
debug1: channel 0: new [client-session]
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
debug1: pledge: network
debug1: client_input_global_request: rtype hostkeys-00@openssh.com want_reply 0
debug1: Sending environment.
debug1: Sending env LANG = en_US.UTF-8
syn1>

I think it is time for me to retire and go fishing !
But before doing that I would like to understand what is happening.