Before changing the hinges I suggest that you use a silicone spray lubricant on the hinges.  Our Neff oven door did not shut properly, we had the hinges replaced under warranty but within a year the door was not shutting properly again.  I removed the door, used the silicone lubricant and now the door shuts properly.  Well worth a try!
                 David of Brisbane
                
 August 2008