Running tasks suspends on "Job releasing memory and waiting"

<%- if @topic_view.topic.tags.present? %>
<%= t 'js.tagging.tags' %>: <%- @topic_view.topic.tags.each do |t| %> <%= t %> <%- end %>
<% end %>

Silverstripe Version:
4.6.1

Question:

We are running an indexing job on a Solr instance through a Silverstripe job. The job keeps hanging with a message of " Job releasing memory and waiting (572.62MB)" We can’t restart the job. It just returns instantly to this message. The DONE column is set to 532 and TOTAL is 31616.

How can we get this job to release memory and continue?

Thank you