Mails not sending correct via sendgrid

We are using Sendgrid to send newsletter. Now there is error message and we noticed that every receiver doesnt get the email, some do but some dont. At it is frustrating. Mailpoet “rearragement” has taken so that the support for paying customer takes weeks to get support. This is is poor support.

Error code we get:

SendingQueue: A new entity was found through the relationship ‘MailPoet\Entities\NewsletterLinkEntity#queue’ that was not configured to cascade persist operations for entity: MailPoet\Entities\SendingQueueEntity@29689. To solve this issue: Either explicitly call EntityManager#persist() on this unknown entity or configure cascade persist this association in the mapping for example @ManyToOne(..,cascade={“persist”}). If you cannot find out which entity causes the problem implement ‘MailPoet\Entities\SendingQueueEntity#__toString()’ to get a clue.

SubscribersCountCacheRecalculation: A new entity was found through the relationship ‘MailPoet\Entities\NewsletterLinkEntity#queue’ that was not configured to cascade persist operations for entity: MailPoet\Entities\SendingQueueEntity@29689. To solve this issue: Either explicitly call EntityManager#persist() on this unknown entity or configure cascade persist this association in the mapping for example @ManyToOne(..,cascade={“persist”}). If you cannot find out which entity causes the problem implement ‘MailPoet\Entities\SendingQueueEntity#__toString()’ to get a clue.

Mixpanel: A new entity was found through the relationship ‘MailPoet\Entities\NewsletterLinkEntity#queue’ that was not configured to cascade persist operations for entity: MailPoet\Entities\SendingQueueEntity@29689. To solve this issue: Either explicitly call EntityManager#persist() on this unknown entity or configure cascade persist this association in the mapping for example @ManyToOne(..,cascade={“persist”}). If you cannot find out which entity causes the problem implement ‘MailPoet\Entities\SendingQueueEntity#__toString()’ to get a clue.