One problem related to transmission gear slipping has been reported for the 2013 Infiniti JX35. The most recently reported issues are listed below.
The transmission started slipping when driving forward and then the car would stall and not move. When putting back in parking and then to drive, the car would move but later back to slipping. Took the car to Infiniti dealer the same day, they ran the diagnosis and reported that the transmission would have to be replaced completely at the cost of $7000 total. The car has 66000 miles on it and has been maintained for all services regularly. No warning light or alert messages showed on dashboard. Opened the case with "Nissan/Infiniti consumer affairs" and waiting for their response.