Hi @ricardo1973
you have a certificate ( https://check-your-website.server-daten.de/?q=baxai.com.br ):
CN=baxai.com.br
21.03.2019
19.06.2019
expires in 78 days baxai.com.br, www.baxai.com.br - 2 entries
You can use that certificate the next 40 - 60 days.
And you have a lot of active Letsencrypt certificates:
CRT-Id Issuer not before not after Domain names LE-Duplicate next LE
1330627239
CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US
2019-03-29 00:09:00
2019-06-26 23:09:00
baxai.com.br, www.baxai.com.br
duplicate nr. 5
next Letsencrypt certificate: 2019-04-03 02:41:17
1330628135
CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US
2019-03-28 21:53:12
2019-06-26 20:53:12
baxai.com.br, www.baxai.com.br
duplicate nr. 4
1330627276
CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US
2019-03-28 20:15:16
2019-06-26 19:15:16
baxai.com.br, www.baxai.com.br
duplicate nr. 3
1327861878
CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US
2019-03-28 03:02:58
2019-06-26 02:02:58
baxai.com.br, www.baxai.com.br
duplicate nr. 2
1324916039
CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US
2019-03-27 02:41:17
2019-06-25 01:41:17
baxai.com.br, www.baxai.com.br
duplicate nr. 1
1304650213
CN="cPanel, Inc. Certification Authority", O="cPanel, Inc.", L=Houston, C=US, ST=TX
2019-03-21 23:00:00
2020-03-21 22:59:59
cloud.baxai.com.br, Domain Control Validated, PositiveSSL, www.cloud.baxai.com.br
1306193891
CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US
2019-03-20 22:18:41
2019-06-18 21:18:41
baxai.com.br, www.baxai.com.br
1306194406
CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US
2019-03-20 19:16:49
2019-06-18 18:16:49
baxai.com.br, www.baxai.com.br
1272211369
CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US
2019-03-10 01:08:10
2019-06-08 00:08:10
baxai.com.br, www.baxai.com.br
1229329736
CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US
2019-02-23 02:37:58
2019-05-24 01:37:58
baxai.com.br, www.baxai.com.br
1221341239
CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US
2019-02-20 21:03:34
2019-05-21 20:03:34
baxai.com.br, www.baxai.com.br
1221270861
CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US
2019-02-20 20:20:29
2019-05-21 19:20:29
baxai.com.br, www.baxai.com.br
1108809734
CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US
2019-01-14 00:38:35
2019-04-13 23:38:35
baxai.com.br, www.baxai.com.br
And a cPanel. Looks like your certificate management doesn't work.
Create one certificate, then use it 60 - 85 days, then create the next certificate.