I appreciate your answer and orientations, I really do, and I am thankful to you for all your work, it has been a fantastic plugin, and hopefully this is just one case.
I made the upgrade from edition 3.0.7, so probably it is something related to another release. The configuration I use on the plugin, is exactly as you described. The problem appeared on two sites, one with about 9.000 posts and another with 3.000. So far the server seems to be back to normal, and I even re-installed the edition 3.0.7 on one of them, which is working fine. If you didn’t get any other alert, this might be a unique case, and I understand, there are infinitive configurations and functions working around on every level and install. But, in any case, I think it is important to go through the plugin changes. If I get any news, I will update here.