Boa tarde, amigos!

Estou com um problema no pfSense de uma filial da empresa que trabalho.
Inicialmente a placa de rede WAN estava travando constantemente, troquei a placa e o problema parecia ter resolvido. Porém, ela voltou a travar, percebi que antes de travar gerou o seguinte log:

Oct 2 14:36:33	sshd	15920	fatal: Unable to negotiate with 58.218.198.148 port 35462: no matching key exchange method found. Their offer: diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1 [preauth]
Oct 2 14:36:59	sshd	16130	fatal: Unable to negotiate with 58.218.198.148 port 46882: no matching key exchange method found. Their offer: diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1 [preauth]
Oct 2 14:37:24	sshd	19253	fatal: Unable to negotiate with 58.218.198.148 port 59796: no matching key exchange method found. Their offer: diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1 [preauth]
Oct 2 14:37:50	sshd	53884	fatal: Unable to negotiate with 58.218.198.148 port 19147: no matching key exchange method found. Their offer: diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1 [preauth]
Oct 2 14:38:16	sshd	54094	fatal: Unable to negotiate with 58.218.198.148 port 30303: no matching key exchange method found. Their offer: diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1 [preauth]
Oct 2 14:38:42	sshd	90444	fatal: Unable to negotiate with 58.218.198.148 port 41565: no matching key exchange method found. Their offer: diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1 [preauth]
Oct 2 14:39:07	sshd	90643	fatal: Unable to negotiate with 58.218.198.148 port 60341: no matching key exchange method found. Their offer: diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1 [preauth]
Oct 2 14:39:13	sshd	92631	fatal: Unable to negotiate with 221.194.47.224 port 49705: no matching key exchange method found. Their offer: diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1 [preauth]
Oct 2 14:39:30	sshd	93134	fatal: Unable to negotiate with 58.218.198.148 port 13682: no matching key exchange method found. Their offer: diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1 [preauth]
Oct 2 14:39:56	sshd	30071	fatal: Unable to negotiate with 58.218.198.148 port 33000: no matching key exchange method found. Their offer: diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1 [preauth]
Oct 2 14:40:22	sshd	33365	fatal: Unable to negotiate with 58.218.198.148 port 44050: no matching key exchange method found. Their offer: diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1 [preauth]
Oct 2 14:40:46	sshd	68451	fatal: Unable to negotiate with 58.218.198.148 port 13073: no matching key exchange method found. Their offer: diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1 [preauth]
Oct 2 14:41:10	sshd	70638	fatal: Unable to negotiate with 58.218.198.148 port 17159: no matching key exchange method found. Their offer: diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1 [preauth]
Oct 2 14:41:38	sshd	6306	fatal: Unable to negotiate with 58.218.198.148 port 50423: no matching key exchange method found. Their offer: diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1 [preauth]

Alguém tem ideia do que pode ser?

[Fez teste de cabeamento ?