Problem with Mailchimp automation (Custom Journey)

Hi, we are also having extreme problems with automation in Mailchimp. We have a linear automation with the following steps: 1. enter Journey when tag is added. 2. delay of 1 hour 3. send email 4. delay of 1 week 5. send 2nd email All points run without errors, only the sending of the emails does not work in some cases. It seems like the contacts skip the points where they are supposed to receive an email. The delay of one hour we have added on the advice of Mailchimp support, because the backend probably needs time to update the database. But still some contacts do not receive the emails. Does anyone else have this problem or a solution? Thank you.