Sometimes broadcast email not working

Your software
My Mautic version is: 4.15
My PHP version is: 7.2.24

Your problem
My problem is: We are sending broadcast emails regularly and its working fine, but sometimes one of the mailings is not working. We schedule the emails like we always do, but they just wont send. All contacts are set to pending and then nothing happens…
Since other broadcasts work fine I suppose the cron is not the issue. Not sure where to look next since the logs are also not showing anything…

These errors are showing in the log: there are no errors shown

Steps I have tried to fix the problem: so far I can only send the email manually.

seems strange. Is it something that is on and off ?

Are you using queuing when sending ?

Some things to check:

  1. Disk space
  2. Memory
  3. You can check to see if the mails are created in /app/spool/default
  4. Try clearing cache in terminal

Yes, it only happened 3 times in the last months. I will check the items you mentioned next time it happens.

I found the error. It indeed is a memory issue. Can this only be solved by adding more RAM?