You don't need a clean installation.
You just need to not enable every single add-on that you have.
When you're selecting your add-ons, click the default button, and before you turn back on any add-ons, stop and think "Do I need this for what I'm doing?" "Is there a chance I think I'll need this for my server?"
Because there's a huge chance that you have conflicting add-ons enabled.