I've been having issues recently with my mailwizz. I migrated to a new server and allocated ca. 1tb of space for hosting my mailwizz to make sure it has enough resources. I left it for a month or so and came back to start testing some campaigns. I started 6 different campaigns on a sample of 15k/each. However, as I started multiple campaigns at the same time, I got the CDbException error. Here's the screenshot: After a couple of minutes, the page went back to normal and I was able to access my mailwizz again. But only 3 of the 6 campaigns were sending something. The rest had the same status, Sending, but they weren't sending anything for hours. I stopped all the campaigns to check and optimize my cron settings. This is what I set it to: https://i.gyazo.com/441f62c0861f6f06998c441fab9aa9a9.png So, with 1k of Campaigns AT Once and PCNTL enabled, I reckoned this would solve the issue. I went back to my forntend and resumed all of my campaigns. A minute later I refreshed and got the same old CDbException error. After a few mins, I refreshed again and got my mailwizz campaigns page back on screen. But, again, only 2 of the 6 campaigns were sending any volume. I checked again an hour later and nothing changed. This issue has been similar to a few others I have been having over the past few months. I did many things. I changed the server, updated the mailwizz version, got more space. Yet, nothing seems to be helping resolve this issue. Has anyone has a similar issue? Where else should I look?