Email erros (mutltiple types), but test e-mail is working

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Hello,
For a couple of weeks I have several errors messages in the dashboard when I do action on WooCommmerce (sending delivery infos, new order on site, etc.), but the test e-mail is always working fine.

Here is a sample of the errors I have :

ERREUR D’ENVOI D’E-MAIL : L’extension WP Mail SMTP v2.2.1 a enregistré cette erreur lors de sa dernière tentative d’envoi :

Mailer: Autre SMTP
SMTP Error: Could not authenticate.

Please review your WP Mail SMTP settings in plugin admin area. Envisagez d’envoyer un e-mail de test après la résolution.

But I also have had other messages, but I diddn’t remember which one.

Until today it seems that errors where not really a problem as e-mails was delivered, but now e-mails are not delivered so that is a real big problem for me.