Have you configured up realtime change detection? This can email you when configs are changed and it will make a copy of the running config as changes are made.
So even if you don't want to receive the email, you can easily look at all the last running configs to see if indeed any changes were made.
Alternatively when you are troubleshooting, you can download a copy of the current config. Then compare it to the one you last downloaded when all was working ok. This will show if there were any changes.
Hope that helps.