Rapidminer Server : Pending Execution (no longer executing process)

I set up a scheduled process to run every morning on the Rapidminer Server that is spun up by an AWS instance. Everything has been working fine until a couple of weeks ago, with no changes to the model, the execution state now just shows "Pending" and not actually running the process anymore. There are no connection issues to the Redshift databases, I already checked. I am able to open the model process, but cannot run it on the server. Any idea of what the issue might be?