I picked up a 2003 patrol a week ago and the front passenger door is very temperamental in regards to shutting. Sometimes it shuts with no problems. Other times it doesnt shut and just bounces back open. To resolve it when it doesnt want to shut at the moment it has to be kinda slammed so that it does shut but i dont waa have to continue doing this.

Has anyone else encountered this problem?
Im going to try and have a look at the locking mechanism on the weekend so any advice would be greatly appreciated.

Cheers in advance!