Hello Victor,
Looks like your server is not able to handle the load. This is not the problem with the plugin or WordPress, but it is just your server is not able to handle the volume of posts.
You have two options now.
1) Increase the amount of memory available to your server. You may have to contact your web host to do it.
2) The other option is to restrict the number of posts that get’s deleted. Since you are using the “Delete from trash” module, you can tweak the post date, so that the number of posts that gets deleted is reduced.