Here are a few WordPress plugins to help you troubleshoot your WordPress site.
- Memory Load Consumption and db size Usage -- Indicates memory and db usage. Check to ensure you aren't close to running out of memory on your site.
- AntiVirus – Protects your site from melicious plugins and themes.
- Broken Link Checker – Automatically validates all links on your site and notifies you by email if any are broken.
- P3 (Plugin Performance Profiler) – Helps you determine what is slowing down your site.
- WP Clear Fix -- Gets you out of trouble when your site starts to give you a hard time.
- WordPress phpinfo() -- Provides you with information about your web hosting environment