I would suggest making sure that all your resources are up to date. Go over every resource one-by-one and check the forums if there is a new version available. If that doesn’t work,you could also try disabling resources one-by-one to figure out which resource is causing issues. Find a new resource if you can.
When you actually developed the resources yourself, here’s some tips:
To track down what part of the script is causing the issue, the only real way is to add debugging statements to your scripts and find out when exactly the crash is happening.
Any information from your players might also be useful. For example, if they mention that the script repeatedly crashes after typing in a specific command, you know where you should start looking for your problem.
Unfortunately there is no easy way.