Problem Solved! Took the car to the dealer after encountering two more glitches. 1. After backing out of driveway, car would not shift into drive unless turned off and restarted. 2. Clock reset over night and changed time zone to Pacific from Eastern.Service tech had not seen such behavior and contacted Infiniti corporate. Thoroughly checked codes and focused on battery terminal. With everything computer controlled, a battery glitch can result in a reset with the kind of results we saw. Found loose post on battery and terminal connection. Replaced battery and negative "terminal current sensor". Glad it appears not to be the transmission. No further problems. Hoping it holds.