I am having this issue as well. I increased the LOG partition size but the error are still showing up. Has anyone increased the Nginx max reserved memory size to see if that helps? I haven't actually done this yet but I'm curious if it will help. I don't want to cause more issues. I do have 128GB of ram so I do mine giving some extra space to these to stop, or at the very least make these errors less common.
Edit the Nginx Configuration:
Open your Nginx configuration file using a text editor. The configuration file is typically located at /etc/nginx/nginx.conf or /etc/nginx/conf.d/your-config-file.conf.
Add the directive nchan_max_reserved_memory 32M; to the appropriate location, often within the http block.
Save the changes and close the editor.