Mailpoet causing massive CPU usage

Hi, there are already a few topics on Mailpoet causing massive CPU usage via a loop, like this one: https://wordpress.org/support/topic/mailpoet-making-for-large-cpu-cycles-even-when-idle/

I have that problem. The interesting thing is: I have 3 websites with mailpoet running. Only one is running wild.

Any suggestion on where the problem in the plugin is? Any updates resolving that problem? It is nearly useless for me now.

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