Emails stopped sending

Anyone able to help me understand what the issue might be?

Versions:
WordPress: 4.9.4
WordPress MS: No
PHP: 7.0.27
WP Mail SMTP: 1.2.5

Params:
Mailer: smtp
Constants: No
ErrorInfo: SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting
Host: smtp.gmail.com
Port: 465
SMTPSecure: ssl
SMTPAutoTLS: bool(true)
SMTPAuth: bool(true)

Server:
OpenSSL: Yes
SMTP Debug:
2018-02-19 22:40:55 Connection: opening to ssl://smtp.gmail.com:465, timeout=300, options=array (
)
2018-02-19 22:40:55 Connection: opened
2018-02-19 22:40:55 SERVER -> CLIENT: 220 smtp.gmail.com ESMTP i17sm23474999ioi.58 – gsmtp
2018-02-19 22:40:55 CLIENT -> SERVER: EHLO sexymamamaternity.com
2018-02-19 22:40:55 SERVER -> CLIENT: 250-smtp.gmail.com at your service, [184.154.232.20]
250-SIZE 35882577
250-8BITMIME
250-AUTH LOGIN PLAIN XOAUTH2 PLAIN-CLIENTTOKEN OAUTHBEARER XOAUTH
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-CHUNKING
250 SMTPUTF8
2018-02-19 22:40:55 CLIENT -> SERVER: AUTH LOGIN
2018-02-19 22:40:56 SERVER -> CLIENT: 334 VXNlcm5hbWU6
2018-02-19 22:40:56 CLIENT -> SERVER: Y2hsb2VAc2V4eW1hbWFtYXRlcm5pdHkuY29t
2018-02-19 22:40:56 SERVER -> CLIENT: 334 UGFzc3dvcmQ6
2018-02-19 22:40:56 CLIENT -> SERVER: SGF0dGluODEx
2018-02-19 22:40:56 SERVER -> CLIENT: 535-5.7.8 Username and Password not accepted. Learn more at
535 5.7.8 https://support.google.com/mail/?p=BadCredentials i17sm23474999ioi.58 – gsmtp
2018-02-19 22:40:56 SMTP ERROR: Password command failed: 535-5.7.8 Username and Password not accepted. Learn more at
535 5.7.8 https://support.google.com/mail/?p=BadCredentials i17sm23474999ioi.58 – gsmtp
2018-02-19 22:40:56 SMTP Error: Could not authenticate.
2018-02-19 22:40:56 CLIENT -> SERVER: QUIT
2018-02-19 22:40:56 SERVER -> CLIENT: 221 2.0.0 closing connection i17sm23474999ioi.58 – gsmtp
2018-02-19 22:40:56 Connection: closed
2018-02-19 22:40:56 SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting