Email Test Failed

Hi guys, my WP Mail SMTP was working fine until some weeks ago, when it just stopped working. It is affecting my Contact Form, created with Contact Form 7, which is not working either. Could you help me? It shows the following message:

Versions:
WordPress: 4.9.2
WordPress MS: No
PHP: 5.6.32
WP Mail SMTP: 1.2.2

Params:
Mailer: smtp
Constants: No
ErrorInfo: SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting
Host: smtp.gmail.com
Port: 587
SMTPSecure: tls
SMTPAutoTLS: bool(true)
SMTPAuth: bool(true)

Server:
OpenSSL: Yes
SMTP Debug:
2018-01-22 18:50:40 Connection: opening to smtp.gmail.com:587, timeout=300, options=array (
)
2018-01-22 18:50:40 Connection: opened
2018-01-22 18:50:40 SERVER -> CLIENT: 220 smtp.gmail.com ESMTP k58sm8136083otd.2 – gsmtp
2018-01-22 18:50:40 CLIENT -> SERVER: EHLO https://www.dnashopper.com.br
2018-01-22 18:50:40 SERVER -> CLIENT: 250-smtp.gmail.com at your service, [13.85.22.206]
250-SIZE 35882577
250-8BITMIME
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-CHUNKING
250 SMTPUTF8
2018-01-22 18:50:40 CLIENT -> SERVER: STARTTLS
2018-01-22 18:50:40 SERVER -> CLIENT: 220 2.0.0 Ready to start TLS
2018-01-22 18:50:40 SMTP Error: Could not connect to SMTP host.
2018-01-22 18:50:40 CLIENT -> SERVER: QUIT
2018-01-22 18:50:40 SERVER -> CLIENT: MIA????S; Y?????O?u??z?c?d?”?$c{P?5W?^3??d?a??g????W(?ρ??Ym????cXgKq???e?<??@?`{???*”Y?8#6?\?_?2WfW???O????#???cj?ɑ?G?u ~?B??,????Y??:HDl5?\??t?;??N???3?%%@??bWA/???91?U?????;???7W?????u????|????w?Y?e(tp:?0???Oe;???++?|?c??XB~??i? 1\?Y???’?,?Z??a?r???”b??n?AnY+A?
2018-01-22 18:50:40 SMTP ERROR: QUIT command failed: MIA????S; Y?????O?u??z?c?d?”?$c{P?5W?^3??d?a??g????W(?ρ??Ym????cXgKq???e?<??@?`{???*”Y?8#6?\?_?2WfW???O????#???cj?ɑ?G?u ~?B??,????Y??:HDl5?\??t?;??N???3?%%@??bWA/???91?U?????;???7W?????u????|????w?Y?e(tp:?0???Oe;???++?|?c??XB~??i? 1\?Y???’?,?Z??a?r???”b??n?AnY+A?
2018-01-22 18:50:40 Connection: closed
2018-01-22 18:50:40 SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting

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