Originally Posted by Volk Z

I had a 2003 350z that had this exact issue start with the 3rd gear... I had NEVER mis-shifted so I knew it wasn't my fault... Needless to say it got worse and worse and eventually the synchro was shot... The transmission was replaced by the dealer with the updated transmission, clutch and one other part... All covered... Car had 18000 miles on it.

This is not something I would let slide. If you haven't already take it to the dealer and get this issue at least filed... Then if down the road it becomes completely shot then you have a case.

Good luck

-Chad