We have a 2001 Nissan Altima GXE, 4cyl, FWD, auto, power doors and windows, with 80580 miles on it. Some days when we start the car, the LCD odometer shows clearly the mileage and trip meters. Other times, the LCD odometer screen is blank until some time later in the course of the trip or when the car is next started. We have tried moving the push button to toggle between odometer and trip meters, without effect, and the weather, such as heat or cold, seems to have no effect either. The odometer is still accurately recording the mileage, it's just not displaying it all the time. Nothing else strange is happening. Any ideas on what could be the trouble?