I recently bought a Micra K12 auto, which runs great. There is one annoying thing which happens sometimes -the automatic gear box gets stuck on first gear and refuses to go up, regardless of the revs reaching 4-5k rpm! The temporary solution for me is to flash hazard lights, restart the car, and most of the time, it works! Are there any pointers to what this could be related to? Is it the gearbox ECU, or the gearbox itself or something else?